php is null



php is null

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notice: undefined variable: var in /srv/www/htdocs/sandbox/null/nulltest.php on line (unset) for the major quirky types/values is_null($var) obviously always returns the opposite of isset($var), and the notice clearly points out the faulty line with the is_null() statement. you might want to examine the return value of 

php is null

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what you're looking for is: if($variable === null) {} php treats null, false, , and the empty string as equal.

php is null

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

php is null

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empty(). from php manual empty(): empty — determine whether a variable is empty. in other words, it will return true if the variable is an empty string, false, array(), null, “?, , and an unset variable.

php is null

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bonsoir à tous, estil possible de tester une variable si elle est null? j'ai essayé que si ma []

php is null

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php is a runtimeinterpreted language that uses late binding, and it's possible to execute code that contains variables that have never been defined. but php's variables can also be defined with a null value, and an undefined variable is different from a variable that has been defined with a null value.

php is null

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

php is null

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there is also a null object, which doesn't really have anything to do with the value null , but its purprose is similar. how many times have you written code, which checks if a value is null, and then displays something special because of that? have you hello, <?php if($user == null): ?> 

php is 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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example. try this code ». <?php; $var = null;; testing the variables; if(is_null($var)){; echo 'this line is printed, because the $var is null.';; }; echo " ";; if(is_null($inexistent)){; echo 'this line is printed, because the $inexistent is null.';; } ?>