收藏的php常用函数（方法）整理推荐收藏保存

PHP加密解密

PHP加密和解密函数可以用来加密一些有用的字符串存放在数据库里，并且通过可逆解密字符串，该函数使用了base64和MD5加密和解密。

function encryptDecrypt($key, $string, $decrypt){ 
    if($decrypt){ 
        $decrypted = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($string), MCRYPT_MODE_CBC, md5(md5($key))), "12"); 
        return $decrypted; 
    }else{ 
        $encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, md5(md5($key)))); 
        return $encrypted; 
    } 
}

function encryptDecrypt($key, $string, $decrypt){

if($decrypt){

$decrypted = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($string), MCRYPT_MODE_CBC, md5(md5($key))), "12");

return $decrypted;

}else{

$encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, md5(md5($key))));

return $encrypted;

}

使用方法如下：

//以下是将字符串“Helloweba欢迎您”分别加密和解密 
//加密： 
echo encryptDecrypt('password', 'Helloweba欢迎您',0); 
//解密： 
echo encryptDecrypt('password', 'z0JAx4qMwcF+db5TNbp/xwdUM84snRsXvvpXuaCa4Bk=',1);

//以下是将字符串“Helloweba欢迎您”分别加密和解密

//加密：

echo encryptDecrypt('password', 'Helloweba欢迎您',0);

//解密：

echo encryptDecrypt('password', 'z0JAx4qMwcF+db5TNbp/xwdUM84snRsXvvpXuaCa4Bk=',1);

PHP生成随机字符串

function generateRandomString($length = 10) { 
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; 
    $randomString = ''; 
    for ($i = 0; $i < $length; $i++) { 
        $randomString .= $characters[rand(0, strlen($characters) - 1)]; 
    } 
    return $randomString; 
}

function generateRandomString($length = 10) {

$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

$randomString = '';

for ($i = 0; $i < $length; $i++) {

$randomString .= $characters[rand(0, strlen($characters) - 1)];

}

return $randomString;

}

PHP获取文件扩展名（后缀）

function getExtension($filename){ 
  $myext = substr($filename, strrpos($filename, '.')); 
  return str_replace('.','',$myext); 
}

function getExtension($filename){

$myext = substr($filename, strrpos($filename, '.'));

return str_replace('.','',$myext);

}

PHP获取文件大小并格式化1

function formatSize($size) { 
    $sizes = array(" Bytes", " KB", " MB", " GB", " TB", " PB", " EB", " ZB", " YB"); 
    if ($size == 0) {  
        return('n/a');  
    } else { 
      return (round($size/pow(1024, ($i = floor(log($size, 1024)))), 2) . $sizes[$i]);  
    } 
}

function formatSize($size) {

$sizes = array(" Bytes", " KB", " MB", " GB", " TB", " PB", " EB", " ZB", " YB");

if ($size == 0) {

return('n/a');

} else {

return (round($size/pow(1024, ($i = floor(log($size, 1024)))), 2) . $sizes[$i]);

}

PHP获取文件大小并格式化2

function format_bytes($size, $delimiter = '') {
    $units = array('B', 'KB', 'MB', 'GB', 'TB', 'PB');
    for ($i = 0; $size >= 1024 && $i < 5; $i++) $size /= 1024;
    return round($size, 3) . $delimiter . $units[$i];
}

function format_bytes($size, $delimiter = '') {

$units = array('B', 'KB', 'MB', 'GB', 'TB', 'PB');

for ($i = 0; $size >= 1024 && $i < 5; $i++) $size /= 1024;

return round($size, 3) . $delimiter . $units[$i];

}

PHP获取文件大小并格式化3

function getFilesize($num){
    $p = 0;
    $format='bytes';
    if($num>0 && $num<1024){
        $p = 0;
        return number_format($num).' '.$format;
    }
    if($num>=1024 && $num<pow(1024, 2)){
        $p = 1;
        $format = 'KB';
    }
    if ($num>=pow(1024, 2) && $num<pow(1024, 3)) {
        $p = 2;
        $format = 'MB';
    }
    if ($num>=pow(1024, 3) && $num<pow(1024, 4)) {
        $p = 3;
        $format = 'GB';
    }
    if ($num>=pow(1024, 4) && $num<pow(1024, 5)) {
        $p = 3;
        $format = 'TB';
    }
    $num /= pow(1024, $p);
    return number_format($num, 3).' '.$format;
}

function getFilesize($num){

$p = 0;

$format='bytes';

if($num>0 && $num<1024){

$p = 0;

return number_format($num).' '.$format;

}

if($num>=1024 && $num<pow(1024, 2)){

$p = 1;

$format = 'KB';

}

if ($num>=pow(1024, 2) && $num<pow(1024, 3)) {

$p = 2;

$format = 'MB';

}

if ($num>=pow(1024, 3) && $num<pow(1024, 4)) {

$p = 3;

$format = 'GB';

}

if ($num>=pow(1024, 4) && $num<pow(1024, 5)) {

$p = 3;

$format = 'TB';

}

$num /= pow(1024, $p);

return number_format($num, 3).' '.$format;

}

PHP替换标签字符

function stringParser($string,$replacer){ 
    $result = str_replace(array_keys($replacer), array_values($replacer),$string); 
    return $result; 
}

function stringParser($string,$replacer){

$result = str_replace(array_keys($replacer), array_values($replacer),$string);

return $result;

}

使用方法：

$string = 'The {b}anchor text{/b} is the {b}actual word{/b} or words used {br}to describe the link {br}itself'; 
$replace_array = array('{b}' => '<b>','{/b}' => '</b>','{br}' => '<br />'); 
echo stringParser($string,$replace_array);

$string = 'The {b}anchor text{/b} is the {b}actual word{/b} or words used {br}to describe the link {br}itself';

$replace_array = array('{b}' => '<b>','{/b}' => '</b>','{br}' => '<br />');

echo stringParser($string,$replace_array);

PHP列出目录下的文件名

function listDirFiles($DirPath){ 
    if($dir = opendir($DirPath)){ 
         while(($file = readdir($dir))!== false){ 
                if(!is_dir($DirPath.$file)) 
                { 
                    echo "filename: $file<br />"; 
                } 
         } 
    } 
}

listDirFiles('home/some_folder/');

function listDirFiles($DirPath){

if($dir = opendir($DirPath)){

while(($file = readdir($dir))!== false){

if(!is_dir($DirPath.$file))

{

echo "filename: $file<br />";

}

listDirFiles('home/some_folder/');

PHP获取当前页面URL

function curPageURL() { 
    $pageURL = 'http'; 
    if (!empty($_SERVER['HTTPS'])) {$pageURL .= "s";} 
    $pageURL .= "://"; 
    if ($_SERVER["SERVER_PORT"] != "80") { 
        $pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"]; 
    } else { 
        $pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"]; 
    } 
    return $pageURL; 
}

echo curPageURL();

function curPageURL() {

$pageURL = 'http';

if (!empty($_SERVER['HTTPS'])) {$pageURL .= "s";}

$pageURL .= "://";

if ($_SERVER["SERVER_PORT"] != "80") {

$pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];

} else {

$pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];

}

return $pageURL;

}

echo curPageURL();

php curl函数

function http_curl($url){
    $curl = curl_init();
    $header[] = "";
    $cookie="";
    curl_setopt($curl,CURLOPT_URL,$url);
    curl_setopt($curl, CURLOPT_HTTPHEADER,$header);
    curl_setopt($curl,CURLOPT_CONNECTTIMEOUT,30);
    curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);
    curl_setopt($curl, CURLOPT_COOKIE, $cookie);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
    //curl_setopt ($curl, CURLOPT_USERAGENT, 'Mozilla/5.0 (iPhone; CPU iPhone OS 9_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13B143 Safari/601.1');
    $response=curl_exec($curl);
    curl_close($curl);
    return $response;
}

function http_curl($url){

$curl = curl_init();

$header[] = "";

$cookie="";

curl_setopt($curl,CURLOPT_URL,$url);

curl_setopt($curl, CURLOPT_HTTPHEADER,$header);

curl_setopt($curl,CURLOPT_CONNECTTIMEOUT,30);

curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);

curl_setopt($curl, CURLOPT_COOKIE, $cookie);

curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);

curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);

//curl_setopt ($curl, CURLOPT_USERAGENT, 'Mozilla/5.0 (iPhone; CPU iPhone OS 9_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13B143 Safari/601.1');

$response=curl_exec($curl);

curl_close($curl);

return $response;

}

PHP 返回13位时间戳

function getMillisecond() { 
  list($t1, $t2) = explode(' ', microtime()); 
  return (float)sprintf('%.0f',(floatval($t1)+floatval($t2))*1000); 
}

function getMillisecond() {

list($t1, $t2) = explode(' ', microtime());

return (float)sprintf('%.0f',(floatval($t1)+floatval($t2))*1000);

}

Unicode解码

方法一：
function unicode_decode($str) {
	//Unicode解码 linux UCS-2BE，windows UCS-2LE
	$t = preg_replace("#\\\u([0-9a-f]{4})#ie", "iconv('UCS-2BE', 'UTF-8', pack('H4', '\\1'))", $str);
	return $t;
}

方法二：
$content = unicode_decode($_POST['content']);
echo $content ;

function unicode_decode($name){
    $json = '{"str":"'.$name.'"}';
    $arr = json_decode($json,true);
    if(empty($arr)) return '';
    return $arr['str'];
}