Removed PHP Function

Also Known As

TL;DR

Explanation

PHP removes deprecated functions across major versions. Notable removals: PHP 7.0 removed mysql_* (use PDO/mysqli), PHP 8.0 removed create_function() (use closures), ereg() family (use preg_*), magic_quotes_gpc, get_magic_quotes_gpc(). PHP 8.1 deprecated passing null to non-nullable parameters. Rector can automatically migrate most removed function calls. Always check the PHP migration guides before upgrading and run PHPStan with the phpstan-deprecation-rules extension.

Common Misconception

Why It Matters

Common Mistakes

• mysql_connect(), mysql_query(), mysql_fetch_array() — removed in PHP 7.0, use PDO.
• create_function() — removed in PHP 8.0, use fn() => or function() {}.
• ereg(), eregi(), ereg_replace() — removed PHP 7.0, use preg_match(), preg_replace().
• each() — removed PHP 8.0, use foreach or array_key_first().

Code Examples

// Removed in PHP 7.0 — fatal error on modern PHP:
$conn = mysql_connect('localhost', 'root', 'pass');
$result = mysql_query('SELECT * FROM users', $conn);
while ($row = mysql_fetch_assoc($result)) { /* ... */ }
mysql_close($conn);

// Removed in PHP 8.0:
$fn = create_function('$x', 'return $x * 2;');
$fn(5);

// Modern PDO — works on PHP 7.0-8.4+:
$pdo = new PDO('mysql:host=localhost', 'root', 'pass');
$stmt = $pdo->query('SELECT * FROM users');
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) { /* ... */ }

// Modern closure:
$fn = fn($x) => $x * 2;
$fn(5);

// Rector migrates automatically:
// vendor/bin/rector process src --config rector.php

References

• ↗ https://www.php.net/manual/en/migration80.incompatible.php

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