Isset php

Php shorthand if isset

$var = $var ?? "default";

Source: stackoverflow.com

If exist php

if (isset($var)) {
  // Code here
}

Php see if undefined

if (isset($variable)) { /* do something */ };

Php isset post

if (!empty($_POST["mail"])) {
    echo "Yes, mail is set";    
} else {  
    echo "No, mail is not set";
}

Source: stackoverflow.com

Php isset

<?php

$var = '';

// This will evaluate to TRUE so the text will be printed.
if (isset($var)) {
    echo "This var is set so I will print.";
}

// In the next examples we'll use var_dump to output
// the return value of isset().

$a = "test";
$b = "anothertest";

var_dump(isset($a));      // TRUE
var_dump(isset($a, $b)); // TRUE

unset ($a);

var_dump(isset($a));     // FALSE
var_dump(isset($a, $b)); // FALSE

$foo = NULL;
var_dump(isset($foo));   // FALSE

?>

Source: php.net

Isset php

$variable=isset($otravariable);

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