Suppose I've a PHP function returning some values.
<?php
function wpse_20131026() {
$var = "I'm a function";
return $var;
}
?>
How can I check whether it's returning empty or not? I tried the following:
<?php
if( !empty( wpse_20131026() ) ) {
//do_something;
}
?>
But it's warning me:
Fatal error: Can't use function return value in write context
empty() checks variables, but not values in php versions, that less than 5.5.
Prior to PHP 5.5, empty() only supports variables; anything else will result in a parse error. In other words, the following will not work: empty(trim($name)). Instead, use trim($name) == false.
So you may use a temporary variable:
$var = wpse_20131026();
if(!empty($var)) {
// do_something with $var
}
Or boolean evaluation directly (without empty() call):
if(wpse_20131026()) {
// do_something
}
