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php为字符串前后添加指定数量字符的方法_php技巧

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Release: 2016-05-16 20:16:14
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本文实例讲述了php为字符串前后添加指定数量字符的方法。分享给大家供大家参考。具体分析如下:

这段php代码定义了两个函数 str_prefix和str_suffix,分别用来给字符串前后添加指定数量的符号

function str_prefix($str, $n=1, $char=" "){
  for ($x=0;$x<$n;$x++){$str = $char.$str;}
  return $str;
}
function str_suffix($str, $n=1, $char=" "){
  for ($x=0;$x<$n;$x++){$str = $str.$char;}
  return $str;
}
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用法举例:

str_prefix('test',3,'-')=>returns'---test'
str_suffix('test',3,'-')=> returns 'test---'
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希望本文所述对大家的php程序设计有所帮助。

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