check whether a variable is set or not in PHP
In this post we will give you information about check whether a variable is set or not in PHP. Hear we will give you detail about check whether a variable is set or not in PHPAnd how to use it also give you demo for it if it is necessary.
Use the PHP isset() function
You can use the PHP isset() function to test whether a variable is set or not. The isset() will return FALSE if testing a variable that has been set to NULL.
Let’s check out an example to understand how this function basically works:
<?php
$var1 = '';
if(isset($var1)){
echo 'This line is printed, because the $var1 is set.';
}
echo "<br>";
$var2 = 'Hello World!';
if(isset($var2)){
echo 'This line is printed, because the $var2 is set.';
}
echo "<br>";
// Unset the variable
unset($var2);
if(isset($var2)){
echo 'This line is printed, because the $var2 is set.';
} else{
echo 'This line is printed, because the $var2 is not set.';
}
echo "<br>";
$var3 = NULL;
if(isset($var3)){
echo 'This line is printed, because the $var3 is set.';
} else{
echo 'This line is printed, because the $var3 is not set.';
}
?>
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