PHP Common functions recommended _php tutorial

1. Generating random String Functions

function Random ($length) {$hash = '; $chars = ' abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz '; $max = Strlen ($chars)-1; Mt_srand (Double) microtime () * 1000000); for ($i = 0; $i < $length; $i + +) { $hash. = $chars [Mt_rand (0, $max)];} return $hash;}

2. Intercept strings of a certain length

Note: This function is valid for GB2312 use

function Wordscut ($string, $length, $sss =0) {if (strlen ($string) > $length) { if ($sss) { $length = $length -3;< c3/> $addstr = ' ... '; } for ($i = 0; $i < $length; $i + +) { if (ord ($string [$i]) > 127) { $wordscut. = $string [$i]. $string [$i + 1]; $i + +; } else { $wordscut. = $string [$i]; } } return $wordscut. $addstr; } return $string;}

3. Obtain the Client IP address

function GetIP () {if (getenv (" Http_client_ip ") && strcasecmp (getenv (" Http_client_ip ")," unknown ") $ip = getenv (" Http_client_ip ") , Else if (getenv ("Http_x_forwarded_for") && strcasecmp (getenv ("Http_x_forwarded_for"), "Unknown" )) $ip = getenv ("Http_x_forwarded_for"); else if (getenv ("REMOTE_ADDR") && strcasecmp (getenv ("REMOTE_ADDR"), "unknown") $ip = Getenv ("REMOTE_ADDR"); else if (isset ($_server[' remote_addr ') && $_server[' remote_addr '] && strcasecmp ($_server[' remote_addr '], "Unknown")) $ip = $_server[' remote_addr ']; else $ip = "Unknown"; return ($IP);}

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4. Create the appropriate folder

function Createdir ($dir = ") { if (!is_dir ($dir)) { $temp = explode ('/', $dir); $cur _dir = "; for ($i =0; $i < }="" @mkdir($cur_dir,0777);="" {="" (!is_dir($cur_dir))="" if="" .="$temp[$i].'/';" $cur_dir="">

5. Determine your email address

function Checkemail ($inAddress) {return (Ereg ("^ ([a-za-z0-9_-]) +@ ([a-za-z0-9_-]) +(. [a-za-z0-9_-]) + ", $inAddress));}

6. Jump

function Gotourl ($message = ', $url = ', $title = "') {$html =" "; if (!empty ($url)) Content= "3;url=". $url. "'" > "; $html. = " Type=text/css rel=stylesheet> "; $html. = " "; cellpadding= ' 4 ' width= ' 100% ' "; $html. = " "; $html. = " "; if (!empty ($url)) $html. = "The system will return after 3 seconds If your browser does not return automatically, Please click [ here ] enter"; else $html. = "[ return ]"; $html. = " "; $html. = " "; Echo $html; Exit;}

7. Paging (use with two functions)

$totalpage = Ceil ($sums/$page _size); if ((! $page) | | ($page 1)) $page =1; $startpos = ($page-1) * $page _size; $sql. = "Limit $startpos, $page _size"; return $sql; }function Showbar ($string = "") {global $page, $totalpage; $out = "Total ". $totalpage. " page "; $linkNum =4; $start = ($page-round ($linkNum/2)) >0? ($page-round ($linkNum/2)): "1"; $end ($page +round ($linkNum/2)): $totalpage; $prestart = $start-1; $nextend = $end +1; if ($page <> 1) $out. = " first page "; if ($start >1) $out. = ". << "; for ($t = $start; $t <= $end; $t + +) { $out. = ($page = = $t)? " [". $t."] ":" >>. "; if ($page <> $totalpage) Title= last page > last page "; return $out;}? >

http://www.bkjia.com/PHPjc/446705.html www.bkjia.com true http://www.bkjia.com/PHPjc/446705.html techarticle 1. Generate random String functions function random ($length) {$hash = '; $chars = ' Abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz '; $max = strlen ($chars)-1; Mt_srand ( ...

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