PHP函数用法

1.<?php

// 示例 1

$pizza = "piece1 piece2 piece3 piece4 piece5 piece6";

$pieces = explode(" ", $pizza);

echo $pieces[0]; // piece1

echo $pieces[1]; // piece2

// 示例 2

$data = "foo:*:1023:1000::/home/foo:/bin/sh";

list($user, $pass, $uid, $gid, $gecos, $home, $shell) = explode(":", $data);

echo $user; // foo

echo $pass; // *

2.<?php

$a=dirname(dirname(__FILE__)); ;

echo $a;//C:\Users\Administrator\Desktop\phpnow

3.mixed str_replace ( mixed $search , mixed $replace , mixed $subject [, int &$count ] )

该函数返回一个字符串或者数组。该字符串或数组是将 subject 中全部的 search 都被 replace 替换之后的结果。

4.函数参数