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php 自定字符串中的部分字符进行替换方法

Jun 13, 2016 am 11:18 AM
php character string Tutorial method replace conduct part

 

php教程 自定字符串中的部分字符进行替换方法

substr_replace()函数对自定字符串中的部分字符进行替换
   语法:substr_replace(str,repl,start,[int length])
   语法说明:
   str——必选参数,指定要操作的原始字符串
   repl——指定替换后的新字符串
   start——指定替换字符串的开始位置
   length——可选参数,指定返回字符串的长度。
   使用substr_replace()函数替换字符串的应用实例:

实例代码:
$b=”手册”;
$c=”zero的php博客”;
echo substr_replace($c,$b,9,4);
?>
输出结果:
zero的php手册

 

参数 描述
string 必需。规定要检查的字符串。
replacement 必需。规定要插入的字符串。
start

必需。规定在字符串的何处开始替换。

  • 正数 - 在第 start 个偏移量开始替换
  • 负数 - 在从字符串结尾的第 start 个偏移量开始替换
  • 0 - 在字符串中的第一个字符处开始替换
charlist

可选。规定要替换多少个字符。

  • 正数 - 被替换的字符串长度
  • 负数 - 从字符串末端开始的被替换字符数
  • 0 - 插入而非替换

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