Online PHP editor | refs for 5mEGK

<?php class Php8CompatUtils { public static function eq($a, $b): bool { // If both $a and $b are of type strings, compare them as strings if (is_string($a) && is_string($b)) { return $a == $b; // may not be === because php says '42' equals '042' true yet '42' === '042' is false. } // If both $a and $b are numeric strings, compare them as numbers if (is_numeric($a) && is_numeric($b)) { return $a == $b; } // If $a is an empty string and $b is 0, or vice versa, return true if (($a === '' && $b === 0) || ($a === 0 && $b === '')) { return true; } // If $a is a non-numeric string and $b is 0, or vice versa, return true if ((is_string($a) && ($a !== '') && ($b === 0)) || (($a === 0) && is_string($b) && ($b !== ''))) { return true; } // special case '123abc' == 123 .. php 7 casts 123abc to 123, then 123 == 123 results in true. lets mimic that. if ((is_string($a) && ($a !== '') && (is_numeric($b)) && ((bool)$b))) { $number = filter_var($a, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION); //"-234.56xyz" return $number == $b; } if (is_numeric($a) && ((bool)$a) && is_string($b) && ($b !== '')) { $number = filter_var($b, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION); //"-234.56xyz" return $a == $number; } // If $a is a number and $b is a non-numeric string, cast $a to string and compare if (is_numeric($a) && is_string($b)) { return strval($a) == $b; } // If $b is a number and $a is a non-numeric string, cast $b to string and compare if (is_string($a) && is_numeric($b)) { return $a == strval($b); } if (is_array($a) || is_array($b)) { return static::standardArrayCompare($a, $b) == 0; } // If $a and $b are both non-numeric strings, compare them directly, we should return true if they are the same return $a == $b; } public static function gt($a, $b): bool { if (static::eq($a, $b)) { return false; } if (is_array($a) || is_array($b)) { return static::standardArrayCompare($a, $b) < 0; } return $a > $b; } public static function lt($a, $b): bool { if (static::eq($a, $b)) { return false; } if (is_array($a) || is_array($b)) { return static::standardArrayCompare($a, $b) > 0; } return $a < $b; } public static function gte($a, $b): bool { if (is_array($a) || is_array($b)) { return static::standardArrayCompare($a, $b) >= 0; } return static::eq($a, $b) || ($a > $b); } public static function lte($a, $b): bool { if (is_array($a) || is_array($b)) { return static::standardArrayCompare($a, $b) <= 0; } return static::eq($a, $b) || ($a < $b); } private static function standardArrayCompare($op1, $op2) { if (count($op1) < count($op2)) { return -1; // $op1 < $op2 } elseif (count($op1) > count($op2)) { return 1; // $op1 > $op2 } foreach ($op1 as $key => $val) { if (!array_key_exists($key, $op2)) { return 1; } elseif (static::lt($val, $op2[$key])) { return -1; } elseif (static::gt($val, $op2[$key])) { return 1; } } return 0; // $op1 == $op2 } } $a = [0 => '']; $b = [0 => 0]; var_dump(Php8CompatUtils::eq($a, $b)); var_dump($a == $b);