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Is negative variable equals empty?

Discussion in 'PHP' started by qwikad.com, Sep 29, 2024.

0
  1. #1
    if($payment) {
    ... do this
    }

    What if $payment is -5 will it be considered empty?
     
    qwikad.com, Sep 29, 2024 IP
  2. sarahk

    sarahk iTamer Staff

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    #2
    I tried this in a sandbox and -5 isn't empty

    <?php

function isItEmpty($num){
    echo (empty($num)? 'yes': 'no')."\n";
}
$tot = 100;
echo isItEmpty(10);
echo isItEmpty(0);
echo isItEmpty(-5);
echo isItEmpty('10');
echo isItEmpty('0');
echo isItEmpty('-5');
echo isItEmpty('');
    Code (markup):
    results
    no
yes
no
no
yes
no
yes
    Code (markup):
     
    sarahk, Sep 29, 2024 IP
    qwikad.com likes this.
  3. GreenHost.Cloud

    GreenHost.Cloud Member

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    #3
    In the context of PHP, a negative variable like $payment = -5 is not considered empty, it's still holding a value. The condition `if($payment)` will be evaluated as true because non-zero numbers are treated as true. So, it would execute the code inside the block.
     
    GreenHost.Cloud, Sep 30, 2024 IP
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  4. qwikad.com

    qwikad.com Illustrious Member Affiliate Manager

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    #4
    When I do a refund, one payment app I'm using, sends it through the same ipn. I'm trying to figure out how I'd tell the script in the ipn file to ignore the refunds (in my instance, negative payments).
     
    qwikad.com, Sep 30, 2024 IP
  5. qwikad.com

    qwikad.com Illustrious Member Affiliate Manager

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    #5
    if($payment > 0) {
    ... do this
    }

    works.
     
    Last edited: Oct 1, 2024
    qwikad.com, Oct 1, 2024 IP
    sarahk likes this.