if(empty($var1)){ echo 'This line is printed, because the $var1 is empty.'; }
jQuery.isEmptyObject( object ); Example: jQuery.isEmptyObject({}) // true jQuery.isEmptyObject({ foo: "bar" }) // false
<?php $a = 0; // True because $a is empty if (empty($a)) { echo "Variable 'a' is empty.<br>"; } // True because $a is set if (isset($a)) { echo "Variable 'a' is set"; } ?>
if (empty($var)) { echo '$var is either 0, empty, or not set at all'; }
empty($var)