PHPのexplode()関数の詳しい説明

explode ( string $delimiter,string $string , int $limit = ?   )

<?php
$sentence1 = "良人当归即好,人生当苦无妨,我有一剑,可搬山";
$sentence2 = explode(",", $sentence1);
print_r($sentence2);

输出：Array( [0] => 良人当归即好 [1] => 人生当苦无妨  [2] => 我有一剑  [3] => 可搬山)

<?php
$sentence1 = "良人当归即好,人生当苦无妨,我有一剑,可搬山";

//$limite为正整数
$sentence2 = explode(",", $sentence1,3);
print_r($sentence2);
echo "<br>";

//$limite为0
$sentence3 = explode(",", $sentence1,0);
print_r($sentence3);
echo "<br>";

//$limite为负整数
$sentence4 = explode(",", $sentence1,-2);
print_r($sentence4);

输出：
Array(   [0] => 良人当归即好      [1] => 人生当苦无妨   [2] => 我有一剑   [3] => 可搬山)
Array(   [0] => 良人当归即好,人生当苦无妨,我有一剑,可搬山)
Array(   [0] => 良人当归即好      [1] => 人生当苦无妨)