![]() ![]() So, it always returns first parameter, unless first parameter happens to be NULL.? is like a "gate" that only lets NULL through.The comment on each line shows the result. Ran the below on php interactive mode ( php -a on terminal). Would then have $a be equal to false and $b equal to 'g'. Once it's no longer null, then you end up with differences in that the ? operator would always return the first argument while the ?: shorthand would only if the first argument was truthy, and that relies on how PHP would type-cast things to a boolean. Of course, this is always assuming the first argument is null. However, even with the notice, PHP will give the same response back. The lines that have the notice are the ones where I'm using the shorthand ternary operator as opposed to the null coalescing operator. Print $b ?: 'e' // Notice: Undefined index: c in /in/apAIb on line 33 Here's some example code to demonstrate this: null) It returns its first operand if it exists and is not NULL The null coalescing operator (?) has been added as syntactic sugarįor the common case of needing to use a ternary in conjunction with The PHP 7.0 migration docs has this to say: When your first argument is null, they're basically the same except that the null coalescing won't output an E_NOTICE when you have an undefined variable. $result = isset($var) ? $var : 'default' Or the second argument otherwise $result = $var ? 'default' Null coalescing ? returns the first argument if it's set and is not null. This means is same as ( isset() isnull() ) Use of shorten isset() isnull() check e. So, it always returns first parameter, unless first parameter happens to be NULL. Or the second argument otherwise $result = $var ?: 'default' The Null Coalescing Operator is like a 'gate' that only lets NULL through. ![]() Elvis ?: returns the first argument if it contains a "true-ish" value (see which values are considered loosely equal to true in the first line of the Loose comparisons with = table). ![]()
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