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This article mainly shows you the "what are the common functions of PHP", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "what common functions PHP has" this article.

PHP common function 1. Generate a random string function

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 $hash; } PHP常用函数2.截取一定长度的字符串 注：该函数对gb2312使用有效 function wordscut($string, $length ,$sss=0) { if(strlen($string) >

$length) {if ($sss) {$length=$length-3; $addstr=@#... @ #;} for ($I = 0; $I

< $length; $i++) { if(ord($string[$i]) >

{$wordscut. = $string [$I]. $string [$I + 1]; $iTunes;} else {$wordscut. = $string [$I];}} return $wordscut.$addstr;} return $string;}

PHP common function 3. Get 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)

}

PHP common function 4. Create the appropriate folder

Function createdir ($dir=@#@#) {if (! is_dir ($dir)) {$temp = explode (@ # / @ #, $dir); $cur_dir = @ # @ #; for

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