Character string flip in php

This article mainly introduces how to implement php string flip, which has good reference value. let's take a look at it together with the small editor. String: $ str = "abcdefg ";

Method 1 (directly use the built-in function strrev ($ str) in php ))

print_r(strrev($str));

Use the for loop method, str_split ($ str)

$ NewArrOne = []; // initialize a new array $ newStrOne = ''; // initialize a new string $ newArrOne = str_split ($ str ); $ arrCount = count ($ newArrOne); for ($ I = 0; $ I <$ arrCount; $ I ++) {$ newStrOne. = $ newArrOne [$ I];} echo"
"; print_r($newStrOne); echo "
";

Use the for loop method, strlen ($ substr)

$ NewStrTwo = ''; // initialize a new string $ arrCountTwo = strlen ($ str); for ($ I = 1; $ I <= $ arrCountTwo; $ I ++) {$ newStrTwo. = substr ($ str,-$ I, 1);} echo"
"; print_r($newStrTwo)."\n"; echo "
";

Use the for loop method, strlen ($ substr)

$ NewStrThree = ''; // initialize a new string $ arrCountThree = strlen ($ str); for ($ I = $ arrCountThree; $ I >=0; $ I --) {@ $ newStrThree. = $ str [$ I];} echo"
";print_r($newStrThree)."\n";echo "
";

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