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what is isset in php

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Frail Ferret answered on August 10, 2020 Popularity 10/10 Helpfulness 2/10

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The isset() function checks whether a variable is set, which means that it has to be declared and is not NULL.

This function returns true if the variable exists and is not NULL, otherwise it returns false.

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Source: Grepper

Tags: isset php

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Contributed on Aug 10 2020

Frail Ferret

0 Answers Avg Quality 2/10

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php isset

Comment

<?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

?>

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Source: www.php.net

Tags: isset isse

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Contributed on Sep 28 2021

claude61340

0 Answers Avg Quality 2/10

isset in php

Comment

$age = 0;
// Evaluates as true because $age is set
if (isset($age)) {
echo '$age is set even though it is empty';
}

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Source: www.phpflow.com

Tags: isset isse

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Contributed on Nov 18 2020

Bored Buzzard

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isset (false) php

Comment

isset() php

$foo = false;

if (isset($foo)) {
   echo "foo is set";
} else {
   echo "foo is not set";
}
// When you pass a value of false to the isset() function in PHP, it will return true because false is a valid value that has been set.

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Tags: isset isse

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Contributed on Mar 09 2023

Hamze Ammar

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php isset function

Comment

$variable = "Hello World";

if(isset($variable)){
    echo "Variable is set.";
} else {
    echo "Variable is not set.";
}

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Contributed on Sep 12 2023

YOU.com

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php if isset

Comment

if (isset(true)) {
}

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Contributed on Feb 07 2021

Eitan Feinberg

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isset php

Comment

$variable=isset($otravariable);

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Contributed on Jun 21 2021

Bloody Bee

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php isset

Comment

if (isset($val)) {
}

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Contributed on Feb 07 2021

Eitan Feinberg

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The isset function in PHP is used to determine whether a variable is set or not. A variable is considered as a set variable if it has a value other than NULL. In other words, you can also say that the isset function is used to determine whether you have used a variable in your code or not before

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Source: Grepper

Tags: isset isse

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Contributed on May 03 2023

Khalid

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what is isset in php

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