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

In PHP, you can compare strings using several built-in functions. Here are some of the most commonly used functions:

strcmp() - Compares two strings and returns 0 if they are equal, a negative value if the first is less than the second, and a positive value if the first is greater than the second.
strcasecmp() - Performs a case-insensitive string comparison.
strpos() - Finds the position of the first occurrence of a substring in a string, which can be used for checking existence.
str_contains() - Checks if a string contains a specific substring (available in PHP 8.0 and later).

Here is an example of how to use these functions to compare strings:


        <?php
        $string1 = "Hello, World!";
        $string2 = "hello, world!";

        // strcmp example
        if (strcmp($string1, $string2) === 0) {
            echo "The strings are identical.";
        } else {
            echo "The strings are not identical.";
        }

        // strcasecmp example
        if (strcasecmp($string1, $string2) === 0) {
            echo "The strings are identical (case insensitive).";
        } else {
            echo "The strings are not identical (case insensitive).";
        }

        // strpos example
        if (strpos($string1, "World") !== false) {
            echo "'World' found in string1.";
        }

        // str_contains example (PHP 8.0+)
        if (str_contains($string1, "Hello")) {
            echo "'Hello' found in string1.";
        }
        ?>

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

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

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