知识大全 20个实用PHP实例代码

Posted 2022-07-21 函数

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　　 PHP可阅读随机字符串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 /************** *@length length of random string (must be a multiple of ) **************/ function readable_random_string($length = ) $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()* ); $max = $length/ ; for($i= ; $i<=$max; $i++) $password =$conso[rand( )]; $password =$vocal[rand( )]; return $password; PHP生成一个随机字符串如果不需要可阅读的字符串使用此函数替代即可创建一个随机字符串作为用户的随机密码等 /************* *@l length of random string */ function generate_rand($l) $c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz "; srand((double)microtime()* ); for($i= ; $i<$l; $i++) $rand = $c[rand()%strlen($c)]; return $rand; PHP编码电子邮件地址使用此代码可以将任何电子邮件地址编码为字符实体以防止被垃圾邮件程序收集 function encode_email($email=’info@domain ’ $linkText=’Contact Us’ $attrs =’’ ) // remplazar aroba y puntos $email = str_replace(’@’ ’&# ;’ $email); $email = str_replace(’ ’ ’&# ;’ $email); $email = str_split($email ); $linkText = str_replace(’@’ ’&# ;’ $linkText); $linkText = str_replace(’ ’ ’&# ;’ $linkText); $linkText = str_split($linkText ); $part = ’<a href="ma’; $part = ’ilto&# ;’; $part = ’" ’ $attrs ’ >’; $part = ’</a>’; $encoded = ’<script type="text/javascript">’; $encoded = "document write(’$part ’);"; $encoded = "document write(’$part ’);"; foreach($email as $e) $encoded = "document write(’$e’);"; $encoded = "document write(’$part ’);"; foreach($linkText as $l) $encoded = "document write(’$l’);"; $encoded = "document write(’$part ’);"; $encoded = ’</script>’; return $encoded; PHP验证邮件地址电子邮件验证也许是中最常用的网页表单验证此代码除了验证电子邮件地址也可以选择检查邮件域所属 DNS 中的 MX 记录使邮件验证功能更加强大 function is_valid_email($email $test_mx = false) if(eregi("^([_a z ]+)( [_a z ]+)*@([a z ]+)( [a z ]+)*( [a z] )$" $email)) if($test_mx) list($username $domain) = split("@" $email); return getmxrr($domain $mxrecords); else return true; else return false; PHP列出目录内容 function list_files($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); PHP销毁目录删除一个目录包括它的内容 /***** *@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 ) == $ds ? substr($dir ) : $dir; if (is_dir($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; PHP解析 JSON 数据与大多数流行的 Web 服务如 itter 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 $json_string=’"id": "name":"foo" "email":"foo@foobar " "interest":["wordpress" "php"] ’; $obj=json_decode($json_string); echo $obj >name; //prints foo echo $obj >interest[ ]; //prints php PHP解析 XML 数据 //xml string $xml_string="<?xml version=’ ’?> <users> <user id=’ ’> <name>Foo</name> <email>foo@bar </name> </user> <user id=’ ’> <name>Foobar</name> <email>foobar@foo </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 $user >email ’<br />’; PHP创建日志缩略名创建用户友好的日志缩略名 function create_slug($string) $slug=preg_replace(’/[^A Za z ]+/’ ’ ’ $string); return $slug; PHP获取客户端真实 IP 地址该函数将获取用户的真实 IP 地址即便他使用代理服务器 function getRealIpAddr() if (!emptyempty($_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 $ip; PHP强制性文件下载为用户提供强制性的文件下载功能 /******************** *@file path to file */ function force_download($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";

　　 PHP创建标签云 function getCloud( $data = array() $minFontSize = $maxFontSize = ) $minimumCount = min( array_values( $data ) ); $maximumCount = max( array_values( $data ) ); $spread = $maximumCount $minimumCount; $cloudHTML = ’’; $cloudTags = array(); $spread == && $spread = ; foreach( $data as $tag => $count ) $size = $minFontSize + ( $count $minimumCount ) * ( $maxFontSize $minFontSize ) / $spread; $cloudTags[] = ’<a href="#" title="’’ $tag ’’ returned a count of ’ $count ’">’ specialchars( stripslashes( $tag ) ) ’</a>’; return join( "n" $cloudTags ) "n"; /************************** **** Sample usage ***/ $arr = Array(’Actionscript’ => ’Adobe’ => ’Array’ => ’Background’ => ’Blur’ => ’Canvas’ => ’Class’ => ’Color Palette’ => ’Crop’ => ’Delimiter’ => ’Depth’ => ’Design’ => ’Encode’ => ’Encryption’ => ’Extract’ => ’Filters’ => ); echo getCloud($arr ); PHP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 similar_text($string $string $percent); //$percent will have the percentage of similarity PHP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 /****************** *@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 $rating) echo ’<img src="($email) ’&default=’ $default ’&size=’ $size ’&rating=’ $rating ’" height=’ $size ’px />’; PHP在字符断点处截断文字所谓断字 (word break) 即一个单词可在转行时断开的地方这一函数将在断字处截断字符串 // Original PHP code by Chirp Internet: chirp au // Please acknowledge use of this code by including this header function myTruncate($string $limit $break=" " $pad=" ") // return with no change if string is shorter than $limit if(strlen($string) <= $limit) return $string; // is $break present beeen $limit and the end of the string? if(false !== ($breakpoint = strpos($string $break $limit))) if($breakpoint < strlen($string) ) $string = substr($string $breakpoint) $pad; return $string; /***** Example ****/ $short_string=myTruncate($long_string ’ ’); PHP文件 Zip 压缩 /* creates a pressed 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 ***/ $files=array(’file jpg’ ’file jpg’ ’file gif’); create_zip($files ’myzipfile zip’ true); PHP解压缩 Zip 文件 /********************** *@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’; PHP为 URL 地址预设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 // 字段此代码将为网址添加该字段 if (!preg_match("/^(|ftp):/" $_POST[’url’])) $_POST[’url’] = ’//’ $_POST[’url’]; PHP将网址字符串转换成超级链接该函数将 URL 和 E mail 地址字符串转换为可点击的超级链接 function makeClickableLinks($text) $text = eregi_replace(’(((f|ht) tp://)[ a zA Z @:%_+ ~#?&//=]+)’ ’<a href=" "> </a>’ $text); $text = eregi_replace(’([[:space:]()[])( [ a zA Z @:%_+ ~#?&//=]+)’ ’ <a href="// "> </a>’ $text); $text = eregi_replace(’([_ a z ]+@([ a z][ a z ]+ )+[a z] )’ ’<a href="mailto: "> </a>’ $text); return $text; PHP调整图像尺寸创建图像缩略图需要许多时间此代码将有助于了解缩略图的逻辑 /********************** *@filename path to the image *@tmpname temporary path to thumbnail *@xmax max width *@ymax max height */ function resize_image($filename $tmpname $xmax $ymax) $ext = explode(" " $filename); $ext = $ext[count($ext) ]; 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; $im = imagecreatetruecolor($newx $newy); imagecopyresized($im $im floor($newx) floor($newy) $x $y); return $im ; PHP检测 ajax 请求大多数的 JavaScript 框架如 jquery Mootools 等在发出 Ajax 请求时都会发送额外的 HTTP_X_REQUESTED_WITH 头部信息头当他们一个ajax请求因此你可以在服务器端侦测到 Ajax 请求 if(!emptyempty($_SERVER[’HTTP_X_REQUESTED_WITH’]) && strtolower($_SERVER[’HTTP_X_REQUESTED_WITH’]) == ’xmlrequest’) //If AJAX Request Then else //something else

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