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php 分隔字符串替数组

Jun 13, 2016 pm 01:11 PM
echo explode limit string

php 分隔字符串为数组
explode

explode ― 使用一个字符串分割另一个字符串
array explode ( string $separator , string $string [, int $limit ] )

此函数返回由字符串组成的数组,每个元素都是 string 的一个子串,它们被字符串 separator 作为边界点分割出来。如果设置了 limit 参数,则返回的数组包含最多 limit 个元素,而最后那个元素将包含 string 的剩余部分。

如果 separator 为空字符串(""),explode() 将返回 FALSE。如果 separator 所包含的值在 string 中找不到,那么 explode() 将返回包含 string 单个元素的数组。

如果 limit 参数是负数,则返回除了最后的 -limit 个元素外的所有元素。此特性是 PHP 5.1.0 中新增的。

由于历史原因,虽然 implode() 可以接收两种参数顺序,但是 explode() 不行。你必须保证 separator 参数在 string 参数之前才行。

注: 构造sql 语句时候 查询列可这么写

$field = explode( ':','*');// 今天才知道explode 这种用法
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官方的demo:
<?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; // *

?>

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