方便水印和缩略图的图形类,图像尺寸调节代码

复制代码 代码如下:

  1. 可阅读随机字符串

复制代码 代码如下:

/**********************
*@filename – path to the image
*@tmpname – temporary path to thumbnail
*@xmax – max width
*@ymax – max height
*/
function resize_image($filename, $tmpname, $xmax, $ymax)
{
$ext = explode(“.”, $filename);
$ext = $ext[count($ext)-1];
if($ext == “jpg” || $ext == “jpeg”)
$im = imagecreatefromjpeg($tmpname);
elseif($ext == “png”)
$im = imagecreatefrompng($tmpname);
elseif($ext == “gif”)
$im = imagecreatefromgif($tmpname);
$x = imagesx($im);
$y = imagesy($im);
if($x <= $xmax && $y <= $ymax)
return $im;
if($x >= $y) {
$newx = $xmax;
$newy = $newx * $y / $x;
}
else {
$newy = $ymax;
$newx = $x / $y * $newy;
}
$im2 = imagecreatetruecolor($newx, $newy);
imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x,
$y);
return $im2;
}

此代码将创建一个可阅读的字符串,使其更接近词典中的单词,实用且具有密码验证功能。

<?php

这里是摘自脚本之家之前发布的文章。更多的技巧可以参考。
收集的二十一个实用便利的PHP函数代码

复制代码 代码如下:

/*
*@author    夜无眠    27262681@qq.com
*copyright    
*/

/**************
*@length – length of random string (must be a multiple of 2)
**************/
function readable_random_string($length = 6){
$conso=array(“b”,”c”,”d”,”f”,”g”,”h”,”j”,”k”,”l”,
“m”,”n”,”p”,”r”,”s”,”t”,”v”,”w”,”x”,”y”,”z”);
$vocal=array(“a”,”e”,”i”,”o”,”u”);
$password=””;
srand ((double)microtime()*1000000);
$max = $length/2;
for($i=1; $i<=$max; $i++)
{
$password.=$conso[rand(0,19)];
$password.=$vocal[rand(0,4)];
}
return $password;
}

class img {
    function __construct($arg = null) {
        $args = func_get_args();
        if($arg == null) {
            return null;
        }
        $this->im =
call_user_func_array(array($this,’create’),$args);
    }

  1. 生成一个随机字符串

    function __call($func,$arg) {
        if(function_exists(‘image’.$func)) {
            $funcstr = ‘image’.$func;
        }elseif (function_exists($func)){
            $funcstr = $func;
        }else {
            error(“没有这个类方法或函数”);
        }
        return call_user_func_array($funcstr,$arg);
    }

如果不需要可阅读的字符串,使用此函数替代,即可创建一个随机字符串,作为用户的随机密码等。

    /*
    *创建图像
    *@param string/int 图片文件路径或者宽度
    *@param int 高度,可省略
    *@param string 6位16进制整数
    */
    function create($arg = null) {
        $args = func_get_args();
        if(is_file($args[0])) {
            $this->file = $args[0];
            $size = getimagesize($this->file) or
error(‘图片类型错误’);
            $this->size = $this->size ? $this->size : $size;
            $type = image_type_to_extension($size[2],false);
            $this->type = $this->type ? $this->type : $type;
            $createfunc = ‘imagecreatefrom’.$type;
            $im = $createfunc($this->file);
        }elseif((int)$args[0]>0 and (int)$args[1]>0) {
            $im = imagecreatetruecolor((int)$args[0],(int)$args[1])
or error(“对不起,参数错误!”);
            if(!$args[2]) {
                $color = hexdec(‘7fffffff’);
                imagecolortransparent($im,$color);
            }else {
                $color = hexdec(str_replace(‘#’,”,$args[2]));
            }
            $this->size = $this->size ? $this->size :
array((int)$args[0] ,(int)$args[1]);
            imagefill($im, 1, 1, $color);
        }else {
            error(“对不起,参数错误!”);
        }
        //imagealphablending($im,false);//这两行用来记录透明通道
        imagesavealpha($im,true);
        imageinterlace($im,true);//开启隔行扫描
        return $im;
    }

复制代码 代码如下:

    /*
    *生成缩略图
    *@param int $w 新图片的宽度
    *@param int $h 新图片的宽度
    *@param string/bool $color 可选,新图片的背景色,false或空为透明
    *@param bool $lashen 可选,是否拉伸,默认不拉伸
    */
    function suolue($w = null,$h = null,$color = false,$lashen = false)
{
        $w_o = imagesx($this->im);
        $h_o = imagesy($this->im);
        if($w == null and $h != null) {
            $w = $h * $w_o/$h_o;
        }elseif ($w != null and $h == null){
            $h = $w * $h_o/$w_o;
        }
        $this->size = null;
        $im = $this->create($w,$h,$color);
        $w_n = $w;
        $h_n = $h;
        if($w_o/$h_o > $w/$h) {
            $h_n = $w*$h_o/$w_o;
            $y = ($h-$h_n)/2;
        }elseif ($w_o/$h_o < $w/$h){
            $w_n = $h*$w_o/$h_o;
            $x = ($w-$w_n)/2;
        }
        if($lashen) {
            $w_n = $w;
            $h_n = $h;
            $x = 0;
            $y = 0;
        }
        imagecopyresampled($im,$this->im,$x,$y,0,0,$w_n,$h_n,$w_o,$h_o);
        //imagedestroy($this->im);
        $this->im = $im;
        return $im;
    }

/*************
*@l – length of random string
*/
function generate_rand($l){
$c= “ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789”;
srand((double)microtime()*1000000);
for($i=0; $i<$l; $i++) {
$rand.= $c[rand()%strlen($c)];
}
return $rand;
}

    /*
    *在图片上写字
    *@param string $str 要写的字符串
    *@param array $arg 字符串相关的参数,为一个关联数组,left
为距左边距离,right为距右边距离,left优先,top为距顶部距离,bottom为距底部距离,top优先;angle为角度,color为6位数16进制颜色,touming为文字透明度,font为字体文件
    */
    function write($str = ” , $arg = array()) {
        $size = $arg[‘size’] ? $arg[‘size’] : 20;
        $angle = $arg[‘angle’] ? $arg[‘angle’] : 0 ;
        $color = $arg[‘color’] ? $arg[‘color’] : ‘000000’;
        $touming = $arg[‘touming’] ? $arg[‘touming’] : 100;
            $touming = dechex((100-$touming)*127/100);
            $color = hexdec($touming.str_replace(“#”,””,$color));
        $font = $arg[‘font’] ? $arg[‘font’] : ‘arial.ttf’;
        $boxarr = imagettfbbox($size,$angle,$font,$str);
        $w = imagesx($this->im);
        $h = imagesy($this->im);

  1. 编码电子邮件地址

        $x_l = $x_r = $boxarr[0];
        $y_t = $y_b = $boxarr[1];
        for($i=0;$i<7;$i = $i+2) {
            $x_l = $boxarr[$i] < $x_l ? $boxarr[$i] : $x_l;
            $x_r = $boxarr[$i] > $x_r ? $boxarr[$i] : $x_r;
            $y_t = $boxarr[$i+1] < $y_t ? $boxarr[$i+1] :
$y_t;
            $y_b = $boxarr[$i+1] > $y_b ? $boxarr[$i+1] :
$y_b;
        }
        $width = $x_r – $x_l;
        $height = $y_b – $y_t;

使用此代码,可以将任何电子邮件地址编码为 HTML
字符实体,以防止被垃圾邮件程序收集。

        /*获取精确偏移量*/
        $im = $this->create($width*4,$height*4);
        $tm = hexdec(‘7fffffff’);
        imagettftext($im,$size,$angle,$width*2,$height*2,$color,$font,$str);
        for($i=0;$i<$width*4;$i++) {
            for($ii=0;$ii<$height*4;$ii++) {
                if(imagecolorat($im,$i,$ii) != $tm) {
                    $x_l = $i;
                    break(2);
                }
            }
        }
        for($i=0;$i<$height*4;$i++) {
            for($ii=$x_l;$ii<$width*4;$ii++) {
                if(imagecolorat($im,$ii,$i) != $tm) {
                    $y_t = $i;
                    break(2);
                }
            }
        }
        for($i=$width*4-1;$i>0;$i–) {
            for($ii=$y_t;$ii<$height*4;$ii++) {
                if(imagecolorat($im,$i,$ii) != $tm) {
                    $x_r = $i;
                    break(2);
                }
            }
        }
        for($i=$height*4-1;$i>0;$i–) {
            for($ii=$x_l;$ii<=$x_r;$ii++) {
                if(imagecolorat($im,$ii,$i) != $tm) {
                    $y_b = $i;
                    break(2);
                }
            }
        }
        $x_off = $x_l – $width*2;
        $y_off = $y_b – $height*2;
        $width = $x_r – $x_l; //精确宽度
        $height = $y_b – $y_t; //精确高度
        imagedestroy($im);

复制代码 代码如下:

        if(isset($arg[‘left’])) {
            $x = (int)$arg[‘left’] – $x_off;
        }elseif (isset($arg[‘right’])){
            $x = $w – (int)$arg[‘right’] – $width – $x_off;
        }else {
            $x = ($w – $width)/2 – $x_off;
        }
        if(isset($arg[‘top’])) {
            $y = (int)$arg[‘top’] – $y_off + $height;
        }elseif (isset($arg[‘bottom’])){
            $y = $h – (int)$arg[‘bottom’] – $y_off;
        }else {
            $y = ($h + $height)/2 – $y_off;
        }

function encode_email($email=’info@domain.com’, $linkText=’Contact Us’,
$attrs =’class=”emailencoder”‘ )
{
// remplazar aroba y puntos
$email = str_replace(‘@’, ‘@’, $email);
$email = str_replace(‘.’, ‘.’, $email);
$email = str_split($email, 5);

        imagettftext($this->im,$size,$angle,$x,$y,$color,$font,$str);
        return $this->im;
    }

$linkText = str_replace(‘@’, ‘@’, $linkText);
$linkText = str_replace(‘.’, ‘.’, $linkText);
$linkText = str_split($linkText, 5);

    /*
    *合并图片(如图片水影)
    *@param string/resource $file 图片文件路径或这图片标识符
    *@param array $arg 字符串相关的参数,为一个关联数组,left
为距左边距离,right为距右边距离,left优先,top为距顶部距离,bottom为距底部距离,top优先;touming为文字透明度
    */
    function merge($file,$arg = array()) {
        if(is_file($file)) {
            $imc = $this->create($file);
        }elseif(gettype($file)==’resource’) {
            $imc = $file;
        }else {
            error(“没有图片”);
        }
        $touming = $arg[‘touming’] ? (int)$arg[‘touming’] : 100 ;
        $w = imagesx($this->im);
        $h = imagesy($this->im);
        $width = imagesx($imc);
        $height = imagesy($imc);
        if(isset($arg[‘left’])) {
            $x = (int)$arg[‘left’];
        }elseif (isset($arg[‘right’])){
            $x = $w – (int)$arg[‘right’] – $width;
        }else {
            $x = ($w – $width)/2;
        }
        if(isset($arg[‘top’])) {
            $y = (int)$arg[‘top’];
        }elseif (isset($arg[‘bottom’])){
            $y = $h – $height – $arg[‘bottom’];
        }else {
            $y = ($h – $height)/2;
        }
        imagecopymergegray($this->im,$imc,$x,$y,0,0,$width,$height,$touming);
    }

$part1 = ‘<a href=”ma’;
$part2 = ‘ilto:’;
$part3 = ‘” ‘. $attrs .’ >’;
$part4 = ‘</a>’;

    /*
    *输出图片
    *@param string $type
    *@param string $filename 要转存的文件路径
    *@param int $zhiliang jpeg图片特有的,图像清晰度
    */
    function display($type = null,$filename = null,$zhiliang = null) {
        if($type == null) {
            $type = $this->type ? $this->type : ‘jpg’;
        }
        if(($type == ‘jpeg’ or $type == ‘jpg’) and $zhiliang == null)
{
            $type = ‘jpeg’;
            $zhiliang = 100;
        }
        if($filename == null) {
            header(‘Content-type: image/’.$type);
        }
        $displayfunc = ‘image’.$type;
        $displayfunc($this->im,$filename,$zhiliang);
        imagedestroy($this->im);
    }

$encoded = ‘<script type=”text/javascript”>’;
$encoded .= “document.write(‘$part1’);”;
$encoded .= “document.write(‘$part2’);”;
foreach($email as $e)
{
$encoded .= “document.write(‘$e’);”;
}
$encoded .= “document.write(‘$part3’);”;
foreach($linkText as $l)
{
$encoded .= “document.write(‘$l’);”;
}
$encoded .= “document.write(‘$part4’);”;
$encoded .= ‘</script>’;

    function randcolor($a,$b) {
        $a = $a>255 ? 255 : (int)$a;
        $a = $a<0 ? 0 : (int)$a;
        $b = $b>255 ? 255 : (int)$b;
        $b = $b<0 ? 0 : (int)$b;
        for($i=0;$i<3;$i++) {
            $color .= str_pad(dechex(mt_rand($a,$b)), 2, “0”,
STR_PAD_LEFT);
        }
        return $color;
    }
}

return $encoded;
}

/*
function error($msg,$debug = false) {
    $err = new Exception($msg);
    $str = “<pre>\n<span style=”color:red”
style=”color:red”>错误:</span>\n”.print_r($err->getTrace(),1).”\n</pre>”;
    if($debug == true) {
        file_put_contents(date(‘Y-m-d’).”.log”,$str);
        return $str;
    }else{
        die($str);
    }
}
*/
?>

  1. 验证邮件地址

这是简单的用法实例

电子邮件验证也许是中最常用的网页表单验证,此代码除了验证电子邮件地址,也可以选择检查邮件域所属
DNS 中的 MX 记录,使邮件验证功能更加强大。

复制代码 代码如下:

复制代码 代码如下:

$img = new img(‘a.png’);
$m = $img->im;
$im = $img->suolue(100);
$img->im = $m;
$img->suolue(300);
$img->merge($m,array(‘left’=>0,’top’=>0,’touming’=>60));
$img->merge($im,array(‘right’=>0,’top’=>0,’touming’=>60));
$img->merge($im,array(‘left’=>0,’bottom’=>0,’touming’=>60));
$img->merge($im,array(‘right’=>0,’bottom’=>0,’touming’=>60));

function is_valid_email($email, $test_mx = false)
{
if(eregi(“^([_a-z0-9-]+)(\.[_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,4})$”,
$email))
if($test_mx)
{
list($username, $domain) = split(“@”, $email);
return getmxrr($domain, $mxrecords);
}
else
return true;
else
return false;
}

$img->write(“春天来了”,array(‘left’=>0,’top’=>0,’size’=>30,’color’=>$img->randcolor(0,180),’angle’=>-45,’font’=>’simfang.ttf’,’touming’=>80));
$img->write(“春天来了”,array(‘left’=>0,’bottom’=>0,’size’=>30,’color’=>$img->randcolor(0,180),’angle’=>45,’font’=>’simfang.ttf’,’touming’=>80));
$img->write(“春天来了”,array(‘right’=>0,’bottom’=>0,’size’=>30,’color’=>$img->randcolor(0,180),’angle’=>-45,’font’=>’simfang.ttf’,’touming’=>80));
$img->write(“春天来了”,array(‘right’=>0,’top’=>0,’size’=>30,’color’=>$img->randcolor(0,180),’angle’=>45,’font’=>’simfang.ttf’,’touming’=>80));
$img->display(“gif”);

  1. 列出目录内容

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复制代码 代码如下:

function list_files($dir)
{
if(is_dir($dir))
{
if($handle = opendir($dir))
{
while(($file = readdir($handle)) !== false)
{
if($file != “.” && $file != “..” && $file != “Thumbs.db”)
{
echo ‘<a target=”_blank”
href=”‘.$dir.$file.'”>’.$file.'</a><br>’.”\n”;
}
}
closedir($handle);
}
}
}

  1. 销毁目录

删除一个目录,包括它的内容。

复制代码 代码如下:

/*****
*@dir – Directory to destroy
*@virtual[optional]- whether a virtual directory
*/
function destroyDir($dir, $virtual = false)
{
$ds = DIRECTORY_SEPARATOR;
$dir = $virtual ? realpath($dir) : $dir;
$dir = substr($dir, -1) == $ds ? substr($dir, 0, -1) : $dir;
if (is_dir($dir) && $handle = opendir($dir))
{
while ($file = readdir($handle))
{
if ($file == ‘.’ || $file == ‘..’)
{
continue;
}
elseif (is_dir($dir.$ds.$file))
{
destroyDir($dir.$ds.$file);
}
else
{
unlink($dir.$ds.$file);
}
}
closedir($handle);
rmdir($dir);
return true;
}
else
{
return false;
}
}

  1. 解析 JSON 数据

与大多数流行的 Web 服务如 Twitter 通过开放 API
来提供数据一样,它总是能够知道如何解析 API 数据的各种传送格式,包括
JSON,XML 等等。

复制代码 代码如下:

$json_string='{“id”:1,”name”:”foo”,”email”:”foo@foobar.com”,”interest”:[“wordpress”,”php”]}
‘;
$obj=json_decode($json_string);
echo $obj->name; //prints foo
echo $obj->interest[1]; //prints php

  1. 解析 XML 数据

复制代码 代码如下:

//xml string
$xml_string=”<?xml version=’1.0′?>
<users>
<user id=’398′>
<name>Foo</name>
<email>foo@bar.com</name>
</user>
<user id=’867′>
<name>Foobar</name>
<email>foobar@foo.com</name>
</user>
</users>”;

//load the xml string using simplexml
$xml = simplexml_load_string($xml_string);

//loop through the each node of user
foreach ($xml->user as $user)
{
//access attribute
echo $user[‘id’], ‘ ‘;
//subnodes are accessed by -> operator
echo $user->name, ‘ ‘;
echo $user->email, ‘<br />’;
}

  1. 创建日志缩略名

创建用户友好的日志缩略名。

复制代码 代码如下:

function create_slug($string){
$slug=preg_replace(‘/[^A-Za-z0-9-]+/’, ‘-‘, $string);
return $slug;
}

  1. 获取客户端真实 IP 地址

该函数将获取用户的真实 IP 地址,即便他使用代理服务器。

复制代码 代码如下:

function getRealIpAddr()
{
if (!emptyempty($_SERVER[‘HTTP_CLIENT_IP’]))
{
$ip=$_SERVER[‘HTTP_CLIENT_IP’];
}
elseif (!emptyempty($_SERVER[‘HTTP_X_FORWARDED_FOR’]))
//to check ip is pass from proxy
{
$ip=$_SERVER[‘HTTP_X_FORWARDED_FOR’];
}
else
{
$ip=$_SERVER[‘REMOTE_ADDR’];
}
return $ip;
}

  1. 强制性文件下载

为用户提供强制性的文件下载功能。

复制代码 代码如下:

/********************
*@file – path to file
*/
function force_download($file)
{
if ((isset($file))&&(file_exists($file))) {
header(“Content-length: “.filesize($file));
header(‘Content-Type: application/octet-stream’);
header(‘Content-Disposition: attachment; filename=”‘ . $file . ‘”‘);
readfile(“$file”);
} else {
echo “No file selected”;
}
}

  1. 创建标签云

复制代码 代码如下:

function getCloud( $data = array(), $minFontSize = 12, $maxFontSize = 30
)
{
$minimumCount = min( array_values( $data ) );
$maximumCount = max( array_values( $data ) );
$spread = $maximumCount – $minimumCount;
$cloudHTML = ”;
$cloudTags = array();

$spread == 0 && $spread = 1;

foreach( $data as $tag => $count )
{
$size = $minFontSize + ( $count – $minimumCount )
* ( $maxFontSize – $minFontSize ) / $spread;
$cloudTags[] = ‘<a style=”font-size: ‘ . floor( $size ) . ‘px’
. ‘” href=”#” title=”\” . $tag .
‘\’ returned a count of ‘ . $count . ‘”>’
. htmlspecialchars( stripslashes( $tag ) ) . ‘</a>’;
}

return join( “\n”, $cloudTags ) . “\n”;
}
/**************************
**** Sample usage ***/
$arr = Array(‘Actionscript’ => 35, ‘Adobe’ => 22, ‘Array’ =>
44, ‘Background’ => 43,
‘Blur’ => 18, ‘Canvas’ => 33, ‘Class’ => 15, ‘Color Palette’
=> 11, ‘Crop’ => 42,
‘Delimiter’ => 13, ‘Depth’ => 34, ‘Design’ => 8, ‘Encode’ =>
12, ‘Encryption’ => 30,
‘Extract’ => 28, ‘Filters’ => 42);
echo getCloud($arr, 12, 36);

  1. 寻找两个字符串的相似性

PHP 提供了一个极少使用的 similar_text
函数,但此函数非常有用,用于比较两个字符串并返回相似程度的百分比。

复制代码 代码如下:

similar_text($string1, $string2, $percent);
//$percent will have the percentage of similarity

  1. 在应用程序中使用 Gravatar 通用头像

随着 WordPress 越来越普及,Gravatar 也随之流行。由于 Gravatar
提供了易于使用的 API,将其纳入应用程序也变得十分方便。

复制代码 代码如下:

/******************
*@email – Email address to show gravatar for
*@size – size of gravatar
*@default – URL of default gravatar to use
*@rating – rating of Gravatar(G, PG, R, X)
*/
function show_gravatar($email, $size, $default, $rating)
{
echo ‘<img
src=”).
‘&default=’.$default.’&size=’.$size.’&rating=’.$rating.'”
width=”‘.$size.’px”
height=”‘.$size.’px” />’;
}

  1. 在字符断点处截断文字

所谓断字 (word
break),即一个单词可在转行时断开的地方。这一函数将在断字处截断字符串。

复制代码 代码如下:

// Original PHP code by Chirp Internet: www.chirp.com.au
// Please acknowledge use of this code by including this header.
function myTruncate($string, $limit, $break=”.”, $pad=”…”) {
// return with no change if string is shorter than $limit
if(strlen($string) <= $limit)
return $string;

// is $break present between $limit and the end of the string?
if(false !== ($breakpoint = strpos($string, $break, $limit))) {
if($breakpoint < strlen($string) – 1) {
$string = substr($string, 0, $breakpoint) . $pad;
}
}
return $string;
}
/***** Example ****/
$short_string=myTruncate($long_string, 100, ‘ ‘);

  1. 文件 Zip 压缩

复制代码 代码如下:

/* creates a compressed zip file */
function create_zip($files = array(),$destination = ”,$overwrite =
false) {
//if the zip file already exists and overwrite is false, return false
if(file_exists($destination) && !$overwrite) { return false; }
//vars
$valid_files = array();
//if files were passed in…
if(is_array($files)) {
//cycle through each file
foreach($files as $file) {
//make sure the file exists
if(file_exists($file)) {
$valid_files[] = $file;
}
}
}
//if we have good files…
if(count($valid_files)) {
//create the archive
$zip = new ZipArchive();
if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE :
ZIPARCHIVE::CREATE) !== true) {
return false;
}
//add the files
foreach($valid_files as $file) {
$zip->addFile($file,$file);
}
//debug
//echo ‘The zip archive contains ‘,$zip->numFiles,’ files with a
status of ‘,$zip->status;

//close the zip — done!
$zip->close();

//check to make sure the file exists
return file_exists($destination);
}
else
{
return false;
}
}
/***** Example Usage ***/
$files=array(‘file1.jpg’, ‘file2.jpg’, ‘file3.gif’);
create_zip($files, ‘myzipfile.zip’, true);

  1. 解压缩 Zip 文件

复制代码 代码如下:

/**********************
*@file – path to zip file
*@destination – destination directory for unzipped files
*/
function unzip_file($file, $destination){
// create object
$zip = new ZipArchive() ;
// open archive
if ($zip->open($file) !== TRUE) {
die (‘Could not open archive’);
}
// extract contents to destination directory
$zip->extractTo($destination);
// close archive
$zip->close();
echo ‘Archive extracted to directory’;
}

  1. 为 URL 地址预设 http 字符串

有时需要接受一些表单中的网址输入,但用户很少添加 http://
字段,此代码将为网址添加该字段。

复制代码 代码如下:

if (!preg_match(“/^(http|ftp):/”, $_POST[‘url’])) {
$_POST[‘url’] = ‘];
}

  1. 将网址字符串转换成超级链接

该函数将 URL 和 E-mail 地址字符串转换为可点击的超级链接。

复制代码 代码如下:

function makeClickableLinks($text) {
$text =
eregi_replace(‘(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+)’,
‘<a href=”\1″>\1</a>’, $text);
$text =
eregi_replace(‘([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)’,
‘\1<a href=”;’, $text);
$text =
eregi_replace(‘([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})’,
‘<a href=”mailto:\1″>\1</a>’, $text);

return $text;
}

  1. 调整图像尺寸

创建图像缩略图需要许多时间,此代码将有助于了解缩略图的逻辑。

复制代码 代码如下:

/**********************
*@filename – path to the image
*@tmpname – temporary path to thumbnail
*@xmax – max width
*@ymax – max height
*/
function resize_image($filename, $tmpname, $xmax, $ymax)
{
$ext = explode(“.”, $filename);
$ext = $ext[count($ext)-1];

if($ext == “jpg” || $ext == “jpeg”)
$im = imagecreatefromjpeg($tmpname);
elseif($ext == “png”)
$im = imagecreatefrompng($tmpname);
elseif($ext == “gif”)
$im = imagecreatefromgif($tmpname);

$x = imagesx($im);
$y = imagesy($im);

if($x <= $xmax && $y <= $ymax)
return $im;

if($x >= $y) {
$newx = $xmax;
$newy = $newx * $y / $x;
}
else {
$newy = $ymax;
$newx = $x / $y * $newy;
}

$im2 = imagecreatetruecolor($newx, $newy);
imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x,
$y);
return $im2;
}

  1. 检测 Ajax 请求

大多数的 JavaScript 框架如 jQuery,Mootools 等,在发出 Ajax
请求时,都会发送额外的 HTTP_X_REQUESTED_WITH
头部信息,头当他们一个ajax请求,因此你可以在服务器端侦测到 Ajax 请求。

复制代码 代码如下:

if(!emptyempty($_SERVER[‘HTTP_X_REQUESTED_WITH’]) &&
strtolower($_SERVER[‘HTTP_X_REQUESTED_WITH’]) ==
‘xmlhttprequest’){
//If AJAX Request Then
}else{
//something else
}

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