php not null



php not null

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a second look into the php specs tells that is_null() checks whether a value is null or not. so, you may pass any value to it, eg. the result of a function. isset() on the other hand is supposed to check for a variable's existence, which makes it a language construct rather than a function. its sole porpuse lies in that checking.

php not null

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null or an empty string? if (!empty($user)) {}. use empty(). after realizing that $user ~= $_post['user'] (thanks matt): var uservariable='';.

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the is_null () function is used to test whether a variable is null or not.

php not null

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from php manual is_null(): is_null — finds whether a variable is null. in other words, it returns true only when the variable is null. is_null() is opposite of isset(), except for one difference that isset() can be applied to unknown variables, but is_null() only to declared variables. the table below is an easy 

php not null

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n°. newneo. posté le à :: profil · answer. empty c'est si c'est vide, alors que null c'est égal à if (is_null($var)) c'est exactement ce que tu veux fr.php.net/manual/fr/function.isnull.php. n'oubliez pas de mettre [resolu] dans le titre quand c'est fini pour 

php not null

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well organized and easy to understand web building tutorials with lots of examples of how to use html, css, javascript, sql, php, and xml.

php not null

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this function checks whether a variable evaluates to what php sees as a "falsy"(a.k.a empty) value. this being said, a variable is empty if it's undefined, null, false, or an empty string. to better understand the way empty works you should think about this function as being the same as: !isset($var) 

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twig the flexible, fast, and secure template engine for php.

php not null

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!empty will check if a variable is set and that it has content. eg: php code: $a = "" isset($a) returns true !empty($a) returns false. null is basically a special, 'null' value, as opposed to an empty string. != null and != "" will return the same thing i think, you need to use !== if you want to check the type as well 

php not null

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zecho nope, here i'm absolutely right: <?php function printname($name = null) { $name = $name ?: 'default'; echo $name."\n"; } printname(); printname('test');. will output: default test. $var === null means that variable is defined (its value is null ).