php array_key_exists



php array_key_exists

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en raison de compatibilité ascendante, la fonction array_key_exists() peut aussi retourner true si le paramètre key est une propriété définie dans un objet, fourni comme paramètre array . ce comportement ne doit plus être pris en considération, et vous devez vous assure que le paramètre array est un tableau.

php array_key_exists

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definition and usage. the array_key_exists() function checks an array for a specified key, and returns true if the key exists and false if the key does not exist. tip: remember that if you skip the key when you specify an array, an integer key is generated, starting at and increases by for each value. (see example ) 

php array_key_exists

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description. bool array_key_exists ( mixed $key , array $search ). array_key_exists() retourne true s'il existe une clé du nom de key dans le tableau search . key peut être n'importe quelle valeur valide d'index de tableau.

php array_key_exists

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php: array_key_exists()l the array_key_exists() function is used to check whether a specified key is present in an array or not. the function returns true if the given key is set in the array. key can be any value possible for an array index.

php array_key_exists

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déc. you can use either the language construct isset , or the function array_key_exists . isset should be a bit faster (as it's not a function), but will return false if the element exists and has the value null . for example, considering this array : $a = array( => 'glop', => null, );. and those three tests, relying 

php array_key_exists

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isset() is faster, but it's not the same as array_key_exists() . array_key_exists() purely checks if the key exists, even if the value is null . whereas isset() will return false if the key exist and value is null .

php array_key_exists

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at work i've got a vm instance of php that includes a pecl extension called vld. this lets you execute php code from the commandline and rather than execute it, it returns the generated opcode instead. it's brilliant at answering questions like this. pecl.php.net/package/vld. just in case you go this 

php array_key_exists

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summary array_key_exists will definitely tell you if a key exists in an array, whereas isset will only return true if the key/variable exists and is not null and empty return true if the variable is an empty string, false, array(), null, “?, , and an unset variable. more details. isset(). from php manual isset():.

php array_key_exists

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the array key is encoded in utf if it indeed comes as utf string from the database. apparently your source code file is not encoded in utf, i'd guess it's encoded in latin. a comparison between a utf byte sequence and a latin byte sequence is therefore unsuccessful. save you source code 

php array_key_exists

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the other responses focus on the differences between the two functions. this is true, but if the source array does not contain null or or "" , (empty values) values you can benchmark the speed of the two functions: <?php function makerandomarray( $length ) { $array = array(); for ($i = ; $i < $length;