4月18日作业： 字符串与数组之间的转换

实例

<?php
echo '<p>字符串函数（三）：字符串与数组之间的转换</p><hr color="green">';
/医院
 * 1.str_split($str,$length)
 * 2.explode($delimiter,$str,$num)
 * 3.imglode($glue,$str)
 */

echo '<pre>';
$str = 'html,css,jquery,php,mysql,thinkphp';
echo '<p>原始字符串：'.$str.'</p>';
//1.str_split($str,$length)
//print_r(str_split($str));
print_r(str_split($str,5));
// echo count(str_split($str));
echo '<hr color="red">';
//2.explode($delimiter,$str,$num)
print_r(explode(',',$str));
print_r(explode(',',$str,5));

//3/implode($glue,$str):按分隔符，将一堆数组拼装成字符串
$arr2 = explode(',',$str);
print_r($arr2);
echo implode(',',$arr2),'<br>';
echo implode('医院*',$arr2),'<br>';
echo implode('',$arr2),'<br>';