21个php常用方法汇总-php教程

资源魔 2020-10-09 22:28:21 87 0

php罕用办法汇总

1. PHP可浏览随机字符串

　　此代码将创立一个可浏览的字符串，使其更靠近辞书中的单词，适用且具备明码验证性能。

/************** *@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; }

　　2. PHP天生一个随机字符串

　　假如没有需求可浏览的字符串，应用此函数代替，便可创立一个随机字符串，作为用户的随秘密码等。

/************* *@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; }

　　3. PHP编码电子邮件地点

　　应用此代码，能够将任何电子邮件地点编码为 html 字符实体，以避免被渣滓邮件顺序搜集。

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); $linkText = str_replace('@', '@', $linkText); $linkText = str_replace('.', '.', $linkText); $linkText = str_split($linkText, 5); $part1 = '<a href="ma'; $part2 = 'ilto:'; $part3 = '" '. $attrs .' >'; $part4 = '</a>'; $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>'; return $encoded; }

　　4. PHP验证邮件地点

　　电子邮件验证兴许是中最罕用的网页表单验证，此代码除了了验证电子邮件地点，也能够抉择反省邮件域所属 DNS 中的 MX 记载，使邮件验证性能愈加弱小。

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; }

　　5. PHP列出目次内容

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); } } }

　　6. PHP销毁目次

　　删除了一个目次，包罗它的内容。

/***** *@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, -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; } }

　　7. PHP解析 JSON 数据

　　与年夜少数盛行的 Web 效劳如 twitter 经过开放 API 来提供数据同样，它老是可以晓得若何解析 API 数据的各类传送格局，包罗 JSON，XML 等等。

$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

　　8. PHP解析 XML 数据

//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 />'; }

　　9. PHP创立日记缩略名

　　创立用户敌对的日记缩略名。

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

　　10. PHP猎取客户端实在 IP 地点

　　该函数将猎取用户的实在 IP 地点，即使他应用代办署理效劳器。

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; }

　　11. PHP强迫性文件下载

　　为用户提供强迫性的文件下载性能。

/******************** *@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"; } }

　　12. PHP创立标签云

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);

　　13. PHP寻觅两个字符串的类似性

　　PHP 提供了一个少少应用的 similar_text 函数，但此函数十分有用，用于比拟两个字符串并前往类似水平的百分比。

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

　　14. PHP正在使用顺序中应用 Gravatar 通用头像

　　跟着 WordPress 愈来愈普及，Gravatar 也随之盛行。因为 Gravatar 提供了易于应用的 API，将其归入使用顺序也变患上非常不便。

/****************** *@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, $rating) { echo '<img src="http://www.gravatar.com/avatar.php?gravatar_id='.md5($email). '&default='.$default.'&size='.$size.'&rating='.$rating.'" width="'.$size.'px" height="'.$size.'px" />'; }

　　15. PHP正在字符断点处截断文字

　　所谓断字 (word break)，即一个单词可正在转行时断开之处。这一函数将正在断字处截断字符串。

// 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, ' ');

　　16. PHP文件 Zip 紧缩

/* 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);

　　17. PHP解紧缩 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'; }

18. PHP为 URL 地点预设 http 字符串

　　有时需求承受一些表单中的网址输出，但用户很少增加 http:// 字段，此代码将为网址增加该字段。

if (!preg_match("/^(http|ftp):/", $_POST['url'])) { $_POST['url'] = 'http://'.$_POST['url']; }

　　19. PHP将网址字符串转换成超等链接

　　该函数将 URL 以及 E-mail 地点字符串转换为可点击的超等链接。

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="http://\2">\2</a>', $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; }

　　20. PHP调整图象尺寸

　　创立图象缩略图需求许多工夫，此代码将有助于理解缩略图的逻辑。

/********************** *@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)-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; }

　　21. PHP检测 ajax 申请

　　年夜少数的 JavaScript 框架如 jquery，Mootools 等，正在收回 Ajax 申请时，城市发送额定的 HTTP_X_REQUESTED_WITH 头部信息，头当他们一个ajax申请，因而你能够正在效劳器端侦测到 Ajax 申请。

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

以上就是21个php罕用办法汇总的具体内容，更多请存眷资源魔其它相干文章！

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