PHP string function (3): conversion between string and array

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* 1.str_split($str,$length=1), according to the number of characters, Split the string into an array, the default is 1

* 2.explode($delimiter,$str,$num): Split the string into an array according to the delimiter, the number of array elements can be specified

* 3.implode($glue, $str): Assemble the one-dimensional array into a string according to the delimiter, separated by spaces by default

echo &#39;<pre class="brush:php;toolbar:false">&#39;;
$str = &#39;html,css,jquery,php,mysql,thinkphp&#39;;
echo &#39;<p>原始字符串:&#39;.$str.&#39;</p>&#39;;

1.str_split($str,$length=1) Split the string into an array according to the number of characters, the default is 1

print_r(str_split($str)); //默认一个字符转为数组中的一个元素
print_r(str_split($str,5)); //5个一组进行转换

2.explode($delimiter,$str,$num): Split the string into an array according to the delimiter, you can Specify the number of array elements

print_r(explode(',',$str)); //用','号进行分割字符串
print_r(explode(',',$str,5)); //指定数组必须是5个元素,最后一个元素保存全部剩余数据

3.implode($glue, $str): Assemble the one-dimensional array into a string according to the delimiter, separated by spaces by default

$arr2 = explode(',', $str);
echo implode(&#39; &#39;, $arr2), &#39;<br>&#39;; //用空格分隔
echo implode(&#39;,&#39;,$arr2), &#39;<br>&#39;; //用,分隔
echo implode(&#39;--&#39;,$arr2), &#39;<br>&#39;; //用--分隔

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