Summary of php explode() function definition and usage (2021)

explode

Function: Use one string to split another string

Syntax:

explode ( string $delimiter , string $string [, int $limit ] ) : array

Parameters:

返回值：

此函数返回由字符串组成的 array，每个元素都是 string 的一个子串，它们被字符串 delimiter 作为边界点分割出来。

如果 delimiter 为空字符串（""），explode() 将返回 FALSE。 如果 delimiter 所包含的值在 string 中找不到，并且使用了负数的 limit ， 那么会返回空的 array， 否则返回包含 string 单个元素的数组。

explode 示例

<?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; // *

?>

返回示例

<?php
/* A string that doesn&#39;t contain the delimiter will simply return a one-length array of the original string. */
$input1 = "hello";
$input2 = "hello,there";
var_dump( explode( &#39;,&#39;, $input1 ) );
var_dump( explode( &#39;,&#39;, $input2 ) );

?>

打印结果

array(1)
(
    [0] => string(5) "hello"
)
array(2)
(
    [0] => string(5) "hello"
    [1] => string(5) "there"
)

limit 示例

<?php
$str = &#39;one|two|three|four&#39;;

// 正数的 limit
print_r(explode(&#39;|&#39;, $str, 2));

// 负数的 limit（自 PHP 5.1 起）
print_r(explode(&#39;|&#39;, $str, -1));
?>

打印结果

Array
(
    [0] => one
    [1] => two|three|four
)
Array
(
    [0] => one
    [1] => two
    [2] => three
)

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