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

<"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。