substr php根据指定的位置和长度获得子字符串
php根据指定的位置和长度获得子字符串 [代码片段(7行)] 输出结果：
<?php
$string = "beginning";
print("Position counted from left: ".substr($string,0,5)."\n");
print("Position counted form right: ".substr($string,-7,3)."\n");
?>
输出结果：
Position counted from left: begin Position counted form right: gin
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