Hướng dẫn php is null
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8) is_null — Finds whether a variable is Descriptionis_null(mixed Parametersvalue The variable being evaluated. Return Values Returns ExamplesExample #1 is_null() example
(E_ALL);$foo = NULL; Notice: Undefined variable: inexistent in ... bool(true) bool(true) See Also
Malfist ¶ 14 years ago
george at fauxpanels dot com ¶ 13 years ago
contact dot 01834e2c at renegade334 dot me dot uk ¶ 7 years ago
ahamilton9 ¶ 4 months ago
ai dot unstmann at combase dot de ¶ 14 years ago
= array(null, true, false, 0, 1, '', "\0", "unset"); etimjoshua4 at gmail dot com ¶ 1 year ago
strrev xc.noxeh@ellij ¶ 14 years ago
normadize (a) gmail (d) com ¶ 10 years ago
michael at cannonbose dot com ¶ 18 years ago
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