![]() PHP apparantly has this funny idea that 0 and 0.0 are also 'empty', by PHP design. For arrays and strings, PHP follows the convention that 'empty' means 'has no members' although arrays and strings are not technically sets. isset Returns TRUE if var exists and has value other than NULL, FALSE otherwise. In the PHP world, apparantly uninitialized variables have the Null value, and isset on such a variable returns FALSE. Since this is takes the array to check as a function argument, PHP will still raise 'notices' if the array itself doesnt exist. The answer in this case, is to use arraykeyexists () instead of isset (). Those two operators give a way to write more concise code and shorten expressions used in PHP. From PHP Manual: isset Determine if a variable is set and is not NULL. However, since they can be iterated, counted, etc, a missing value is not the same as one whose value is null. ![]() ![]() While those operators arenât new, they arenât used that often, so letâs try to demystify them. That was a good candidate for a blog post. While I was working on a PHP project I came across those two notations ? and ?: and realized that itâs not always obvious to determine when using one versus the other. To make it more convenient, PHP 7.0 added support for a null coalescing operator that is syntactic sugar of a ternary operator and isset (): ![]()
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