php怎么将字符串炸开

把字符串打散为数组：

<?php
$str = "Hello world. I love Shanghai!";
print_r (explode(" ",$str));
?>

输出：

Array ( [0] => Hello [1] => world. [2] => I [3] => love [4] => Shanghai! )

使用 limit 参数来返回一些数组元素：

<?php
$str = 'one,two,three,four';
// 零 limit
print_r(explode(',',$str,0));
// 正的 limit
print_r(explode(',',$str,2));
// 负的 limit
print_r(explode(',',$str,-1));
?>

输出：

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

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