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Is the string valid for use with strtotime ()?

PHP has strtotime(), which assumes that the input you enter is a string that represents the actual time. Before use strtotime(), how can I verify that the string that should be provided to it is in one of its valid formats?

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strtotime()returns false if it cannot understand your date format, so you can check its return value. The function has no side effects, so trying to call it will not hurt.

// $format = ...

if (($timestamp = strtotime($format)) !== false) {
    // Obtained a valid $timestamp; $format is valid
} else {
    // $format is invalid
}

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