substr_replace用于在指定字符串中替换指定位置的子字符串
/**
* PHP字符串替换函数substr_replace()使用代码演示
*
* @param
* @arrange 512-笔记网: 512Pic.com
**/
$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",2)."\n");
/*** 来自编程之家 jb51.cc(jb51.cc) ***/
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!
(10 minutes later)
Warning: System will shutdown in 5 minutes!