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:

delimiter	The delimiter character on the boundary.
string	The input string.
limit	If the limit parameter is set and is a positive number, the returned array contains at most limit elements, and the last element will contain the remainder of the string part. If the limit parameter is a negative number, all elements except the last -limit elements are returned. If limit is 0, it will be treated as 1.

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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