How to Check if String contains only Alphabets and Numbers in PHP - Step by Step Examples

How to Check if String contains only Alphabets and Numbers in PHP ?

Answer

To check if a string contains only alphabets and numbers in PHP, you can use the preg_match function with a regular expression pattern.

✐ Examples

1 Check if String contains only Alphabets and Numbers using preg_match

In this example,

We create a regular expression pattern that matches alphabets and numbers only.
We use the preg_match function to check if the string matches the pattern.
If the string contains only alphabets and numbers, containsOnlyAlphabetsAndNumbers will be true, otherwise false.
Finally, we print the result.

PHP Program

<?php 
$str = 'Hello123';
$pattern = '/^[a-zA-Z0-9]+$/';
if (preg_match($pattern, $str)) {
    $containsOnlyAlphabetsAndNumbers = true;
} else {
    $containsOnlyAlphabetsAndNumbers = false;
}
echo "String contains only alphabets and numbers: ".($containsOnlyAlphabetsAndNumbers ? 'true' : 'false');
?>

Output

String contains only alphabets and numbers: true

Summary

In this tutorial, we learned How to Check if String contains only Alphabets and Numbers in PHP language with well detailed examples.

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