php字符串替换函数substr_replace()用法实例

本文实例讲述了php字符串替换函数substr_replace()用法。分享给大家供大家参考。具体分析如下：

substr_replace用于在指定字符串中替换指定位置的子字符串

<?php
$string = "warning: system will shutdown in nn minutes!";
$pos = strpos($string, "nn");
print(substr_replace($string, "15", $pos, 2)."\n");
sleep(10*60);
print(substr_replace($string, "5", $pos, 2)."\n");
?>

上面代码输入如下结果

warning: system will shutdown in 15 minutes!
(10 minutes later)
warning: system will shutdown in 5 minutes!

希望本文所述对大家的php程序设计有所帮助。