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<?php |
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declare(strict_types=1); |
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5
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namespace Lit\Air; |
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7
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class Utils |
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{ |
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/** |
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* Test if a value is a sequential array. |
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* |
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* @param mixed $val The tested value. |
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* @param int|null $expectedLength If non null, only return true if the array length is exactly this value. |
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* @return bool Whether the tested value is a sequential array. |
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*/ |
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public static function isSequentialArray($val, ?int $expectedLength = null): bool |
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{ |
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if (!is_array($val)) { |
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return false; |
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} |
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$cnt = count($val); |
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if ($cnt === 0) { |
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return $expectedLength === null || $expectedLength === 0; |
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} |
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// non-empty sequential array must have zero index, fast exit for 99% assoc arrays |
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if (!array_key_exists(0, $val)) { |
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return false; |
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} |
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// fast exit for length assertion |
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if ($expectedLength !== null && $expectedLength !== $cnt) { |
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return false; |
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} |
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$idx = 0; |
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foreach ($val as $k => $v) { |
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if ($k !== $idx++) { |
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return false; |
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} |
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} |
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return true; |
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} |
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} |
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litphp /
air
