Implement string flip in php

String:$str = "abcdefg";

Method 1 (directly use PHP’s built-in function strrev($str))

print_r(strrev($str));

Use for loop, str_split($str)

$newArrOne = [];//初始化一个新的数组
 $newStrOne = '';//初始化一个新的字符串
 $newArrOne = str_split($str);
 $arrCount = count($newArrOne);
 for ($i=0; $i < $arrCount; $i++) {
 $newStrOne.=$newArrOne[$i];
 }
 echo "<pre class="brush:php;toolbar:false">";
 print_r($newStrOne);
 echo "

";

Use for loop, strlen($substr)

$newStrTwo = '';//初始化一个新的字符串
 $arrCountTwo = strlen($str);
 for ($i=1; $i <= $arrCountTwo; $i++) {
 $newStrTwo.=substr($str, -$i, 1);
 }
 echo "<pre class="brush:php;toolbar:false">";
 print_r($newStrTwo)."\n";
 echo "

";

Use for loop method, strlen($substr)

$newStrThree = '';//初始化一个新的字符串
$arrCountThree = strlen($str);
for ($i = $arrCountThree; $i>=0;$i--) {
 @$newStrThree.=$str[$i];
}
echo "<pre class="brush:php;toolbar:false">";
print_r($newStrThree)."\n";
echo "

";　

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