PHP string flip example code_PHP tutorial

Character flipping is a piece of cake for PHP to process. PHP's string function strrev can handle it. For example:

echo strrev("Hello World!"); //The output result is "!dlroW olleH"

But sometimes during interviews we often need to write a function ourselves to achieve the same effect as strrev. In fact, this is not difficult, for example:

/**

* Function to implement string flipping

* @param string $str The string to be processed

* @return string The successfully flipped string

​*/

function reverse($str){

If($str == ''){

        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!"); //The output result is "!dlroW olleH"

Excerpted from: Shine’s Holy Paradise

http://www.bkjia.com/PHPjc/478625.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/478625.htmlTechArticle Character flipping is a piece of cake for PHP processing. PHP’s string function strrev can handle it. For example ： echo strrev(Hello World!); //The output result is !dlroW olleH But sometimes interviews...