PHP Function List
key_exists doesn't exist. Closest matches:
- array_key_exists
- file_exists
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- dba_exists
- apc_exists
- method_exists
- class_exists
- trait_exists
- interface_exists
- msg_queue_exists
- yp_next
- exit
- function_exists
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Site Search Results
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array_key_exists (PHP 4 >= 4.0.7, PHP 5) array_key_exists — Checks if the given key or index exists in the array
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Whether it's a null, false, true, or any value. It depends on ARRAY_KEY_EXISTS for it's functionality which also works with Objects. Feel free to improve on this anyone ;D
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The overhead associated with calling a function makes it slower, than using isset($array[$key]), instead of array_key_exists($key, $array) using isset() is usually about 1.3 times ...
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//very fast lookup, this beats any other kind of search if (array_key_exists ($key, $inverse)) { $index = $inverse [$key]; return $normal [$index];
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In a similar vein to the previous note, To check in PHP4 if an object has a property, even if the property is null: <?php if(array_key_exists ('propertyName', get_object_vars ($myObj)))
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array_ key_ exists; array_ keys; array_ map; array_ merge_ recursive; array_ merge; array_ multisort; array_ pad; array_ pop; array_ product; array_ push; array_ rand; array_ reduce
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array_search() - Searches the array for a given value and returns the corresponding key if successful; isset() - Determine if a variable is set and is not NULL; array_key_exists() ...
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Finally, I show how to check whether a variable is defined by using array_key_exists(): <?php function too (){$roo = array_key_exists ('foo', compact ('foo'));
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array_ key_ exists; array_ keys; array_ map; array_ merge_ recursive; array_ merge; array_ multisort; array_ pad; array_ pop; array_ product; array_ push; array_ rand; array_ reduce

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For a quick overview over all documented PHP functions, click here.
