PHP字符串翻转实例代码

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Release： 2016-05-25 17:09:58

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字符翻转对于php处理来说，简直是小菜一碟，php的字符串函数strrev就可以处理例如

 字符翻转对于php处理来说，简直是小菜一碟，php的字符串函数strrev就可以处理例如

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但有时候面试的时候往往需要我们自己来写个函数来实现跟strrev同样的效果,其实这也不难,例如:

/**
 * 实现字符串翻转的函数
 * @param string $str 要处理的字符串
 * @return string 翻转成功的字符串
*/
function reverse($str){
 if($str == &#39;&#39;){
 return null;
}
 if(strlen($str) == 1){
 return $str;
}else{
 $string ="";
for($i=1;$i<=strlen($str);$i++){
 $string .=substr($str,-$i,1);
}
 return $string;
}
}

echo reverse("Hello World!"); //输出结果为"!dlroW olleH"

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PHP字符串翻转实例代码

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