How to implement string flip in php

String:$str = "abcdefg";

Directly use PHP’s built-in function strrev($str)

print_r(strrev($str));

Use the for loop method, 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 the for loop method, 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 "

";　

Recommended tutorial: PHP video tutorial

The above is the detailed content of How to implement string flip in php. For more information, please follow other related articles on the PHP Chinese website!