PHPで文字列を展開する方法

explode(separator,string,limit)

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

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

<?php
$str = &#39;one,two,three,four&#39;;
// 零 limit
print_r(explode(&#39;,&#39;,$str,0));
// 正的 limit
print_r(explode(&#39;,&#39;,$str,2));
// 负的 limit
print_r(explode(&#39;,&#39;,$str,-1));
?>

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