In this article I describe the PHP how to reverse and how to identify string is empty or not.
IntroductionIn this article I describe how to use PHP to reverse a string and how to determine whether a string is empty. To learn some other string functions, go to:
Reverse stringTo reverse a string you can simply use the strrev() function.
ExampleThe following example shows how to reverse a string using the strrev() function. The strrev() function takes a string argument like "PHP nrael I" and returns the entire string in reverse order like "I learn PHP".
<?php
// define string
$str = "PHP nrael I";
// reverse string
// result: "detpecca sserpxE naciremA dna draCretsaM ,asiV"
$revstr = strrev($str);
echo $revstr;
?>
Output
Checking for an empty string value
If you want to determine if a string is empty then use a combination of PHP's isset() and trim() functions.
ExampleIn the following example the isset() function verifys that the string variable exists and then uses the trim() function to trim white spaces from the edges and equate it to an empty string.<?php// define string$str = " ";// check if string is empty// result: "Empty"echo (!isset($str) || trim($str) == "") ? "String is Empty" : "String is not Empty";?>
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