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PHP isset() Function, run and write PHP code.
PHP isset() Function - online editor.
The isset() PHP function is used to check whether a variable is set or not, or isset - Determines whether a variable is set and not NULL
If a variable is already unset with unset() function, it will no longer be set.
The isset() function return false if testing variable contains a NULL value.
Syntax:
isset(variable, Optional - Another variable to check);
Tags: If a variable is already unset with unset() function, it will no longer be set.
The isset() function return false if testing variable contains a NULL value.
Syntax:
isset(variable, Optional - Another variable to check);
Example :
isset () - Determines whether a variable is set and not NULL.
isset () - Determines whether a variable is set and not NULL.
<?php
$x = 11;
// True because $x is set
if (isset($x)) {
echo "Variable 'x' is set.<br>";
}
$y = null;
// False because $y is NULL
if (isset($y)) {
echo "Variable 'y' is set.";
}
?>
PHP isset() Function 6
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