The current element is saved in a variable or key-value pair of variables which can. I'm not sure which would be more memory-efficient using a foreach($key=>value) statement and just ignoring $value versus a foreach(array_keys()) statement. each() and foreach() automatically loop through the collection of elements.
This is because when the second loop executes, entry is still a reference. is both easier to use and slightly faster. This is useful when keys might be only a few of the keys in the array - otherwise foreach (arrayToWalk as key > value).
FOREACH PHP WITH KEY CODE
Instead, you're just interested in the keys and are just throwing the values away. This is an example why pass-by-reference in foreach loops is BAD. Simpler more efficient code once you have keys: foreach (keys as key).
Well, if PHP developers decided that a function called array_ key should suddenly return array values, then I sure hope it's something released on April 1st, otherwise I would be quite perplexed.Īs for the rest of your post, I suppose the reason you're getting a warning is that Zend just wanted to make sure you realized that the whole point for PHP to loop through the array was (normally) to store each value into a variable for you to use. But in reality, there are many types of loops, and both can be used pretty effectively. FOREACH loops are the best loop for iterating through arrays. FOR loops are the best loop for iterating code until a given condition is met. Is the behavior going to change in newer or older versions of PHP? (Basically is it going to start populating $key with "value information"?) An alternative to the PHP FOREACH loop is the PHP FOR loop.
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