For backward compatibility reasons, array_key_exists() will also return true if key is a property defined within an object given as array. this behaviour should not be relied upon, and care should be taken to ensure that array is an array .. Complete php array reference. for a complete reference of all array functions, go to our complete php array reference. the reference contains a brief description, and examples of use, for each function!. Array_keys() returns the keys, numeric and string, from the array. if the optional search_value is specified, then only the keys for that value are returned. otherwise, all the keys from the array are returned..
What you mean if you don't know the key of the element of which you want to change the value?? how that can happen? if your array is all associative then you need to use the key itself.. I've got an array containing animals. i print out the array using a foreach loop. i would like to update the value of a specific key, without changing any of the other values which have different keys.. $_session is an array, but to comparmentalise data you can create arrays within that array. if you do that with your data, you would not need to rename the keys in the the name value pairs as they will be unique within the new sub array..
