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批改状态：合格
老师批语：
<?php
$a = 'acjd';
echo strlen($a);
$b =['a','b','v','d'];
echo '<hr color="red">';
$c = implode('**',$b);
echo $c ;
$gg ='explode';
echo '<hr color="green">';
$gh = str_split($gg,2);
print_r($gh );
echo '<hr color="yellow">';
echo strpos('www.baidu.com','baidu');
echo "<hr color='black'>";
echo str_replace("baidu","taobao","www.baidu.com");
?>点击 "运行实例" 按钮查看在线实例
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