In PHP, how do I validate strings with built-in functions?

In PHP, validating strings can be done using several built-in functions such as `strlen()`, `ctype_alpha()`, `filter_var()`, and more. These functions help ensure that the data meets specific criteria before processing.

PHP, string validation, built-in functions, `strlen`, `ctype_alpha`, `filter_var`

This content provides an overview of how to validate strings in PHP using built-in functions, showcasing various methods to ensure data integrity.

<?php // Example of string validation in PHP $str = "HelloWorld123"; // Check if the string length is greater than 5 if (strlen($str) > 5) { echo "Valid string length.<br>"; } // Check if the string contains only letters if (ctype_alpha($str)) { echo "String contains only letters.<br>"; } else { echo "String contains non-letter characters.<br>"; } // Validate email $email = "example@example.com"; if (filter_var($email, FILTER_VALIDATE_EMAIL)) { echo "Valid email address.<br>"; } else { echo "Invalid email address.<br>"; } ?>

PHP string validation built-in functions `strlen` `ctype_alpha` `filter_var`

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