php字符串替換函數substr_replace()用法實例

本文實例講述了php字符串替換函數substr_replace()用法。分享給大家供大家參考。具體分析如下：

substr_replace用於在指定字符串中替換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");
?>

上面代碼輸入如下結果

Warning: System will shutdown in 15 minutes!
(10 minutes later)
Warning: System will shutdown in 5 minutes!

希望本文所述對大家的php程序設計有所幫助。