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
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<?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");
?>
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上面代码输入如下结果
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Warning: System will shutdown in 15 minutes!
(10 minutes later)
Warning: System will shutdown in 5 minutes!
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希望本文所述对大家的php程序设计有所帮助。