Check Whether $_Post-Value Is Empty

Check whether $_POST-value is empty

isset() will return true if the variable has been initialised. If you have a form field with its name value set to userName, when that form is submitted the value will always be "set", although there may not be any data in it.

Instead, trim() the string and test its length

if("" == trim($_POST['userName'])){
    $username = 'Anonymous';
}      

Check if a POST value is empty

Use !empty() instead of isset();

<?php
    if (!empty($_POST["username"]) && !empty($_POST["submit"])) {
        echo "filled";
    } else {
        echo "not filled";
    }

Check if $_POST exists

if( isset($_POST['fromPerson']) )
{
     $fromPerson = '+from%3A'.$_POST['fromPerson'];
     echo $fromPerson;
}

PHP Correctly checking if a post variable is empty

This link may be useful: https://www.virendrachandak.com/techtalk/php-isset-vs-empty-vs-is_null/

Use the empty function to check if a variable contents something:

<?php
if (isset($_POST['var']) && !empty($_POST['var'])) {
    echo $_POST['var'];
}
else {
    echo 'Please ensure you have entered your details';
}
?>

How can I check in PHP if a $_POST is empty or zero?

You could check for the string "0" (all $_POST variables are strings or arrays of strings):

if ($_POST['NumAthletes_Ratings'] > 0) {
        echo 'POST Parameter is set to ' . $_POST['NumAthletes_Ratings'];
    } elseif ($_POST['NumAthletes_Ratings'] === '0') {
        echo 'POST Parameter is set to 0';
    } else {
        echo 'POST Parameter is empty';
    }

If $_POST is empty function

I think what you are looking for is something like:

if(!empty($_POST['foo'])) {
   echo "a sentence".$_POST['foo']." with something in the middle.";
}

This will check that the value is NOT empty, however empty means a lot of things in PHP so you may need to be more specific. For example you may want to check simple if its set:

if(isset($_POST['foo'])) {
   echo "a sentence".$_POST['foo']." with something in the middle.";
}

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