How to check if a variable is empty in PHP?
Use the empty() function. It returns true when the variable does not exist or has a false-like value, and false otherwise.
<?php
$a = "";
$b = "0";
$c = "Hello";
var_dump(empty($a));
var_dump(empty($b));
var_dump(empty($c));
?>Output:
Tutorials Class - Output Window
bool(true)
bool(true)
bool(false)
These values are all empty: "", 0, 0.0, "0", null, false, [] and an undefined variable. The string “0” is a surprise for many people, so do not use empty() when 0 is a valid value.
Read the full chapter PHP empty() and the comparison isset() vs empty() vs is_null().
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| PHP Variables |