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  1. #1
    Registered User
    Join Date: Apr:2017
    Location: Antwerpen
    Posts: 7

    Question PHP

    ,
    PHP empty() ?

    :

    Click image for larger version. 

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    :

    PHP Code:
    <form method="post" action="index.php">
                <label for="dikte">Dikte van het ijs:</label><input id="dikte" type="text" name="dikte">
                <input type="submit" value="JA of NEEN?">
            </form>
            <?php
               $dikteIjs 
    filter_input(INPUT_POST"dikte");
               if(
    $dikteIjs >= 15)
               {
                   echo empty(
    $dikteIjs);
                   echo 
    "Dikte van het ijs:$dikteIjs";
                   echo 
    "<p><img src=\"afbeeldingen/succes.png\" alt=\"succes\" title=\"succes\"/>,Hoera, de Elfstedentocht kan doorgaan!</p>";
               }
               
               else{
                   echo 
    "Dikte van het ijs:,$dikteIjs";
                   echo 
    "<p><img src=\"afbeeldingen/helaas.png\" alt=\"succes\" title=\"succes\"/>,Helaas, het ijs is nog niet dik genoeg</p>";
               }    
            
    ?>
    :

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    .

    .

  2. #2
    Registered User odido's Avatar
    Join Date: Feb:2015
    Location: Bulgaria
    Posts: 529
    , if empty() echo . :
    PHP Code:
    if (empty($var)) {
        echo 
    '$var is either 0, empty, or not set at all';

    Last edited by odido; 20th April 2017 at 19:35.
    Lenovo R61i/8GB DDR2 800/T7700 2.4Ghz /Adata SSD 240GB

  3. #3
    Registered User
    Join Date: Sep:2006
    Location: everywhere
    Posts: 348
    . PHP , . ( , /). : https://www.w3schools.com/php/showph...ation_complete
    - , jQuery/AJAX, ,
    Last edited by bradata; 20th April 2017 at 22:25.

  4. #4
    Registered User
    Join Date: Apr:2017
    Location: Antwerpen
    Posts: 7
    ,

    :


    PHP Code:
    <form method="post" action="index.php">
                <label for="dikte">Dikte van het ijs:</label><input id="dikte" type="text" name="dikte">
                <input type="submit" value="JA of NEEN?">
            </form>
            <?php

               $dikteIjs 
    filter_input(INPUT_POST"dikte");
              if(empty(
    $dikteIjs)==0){
               if(
    $dikteIjs >= 15)
               {
                   echo empty(
    $dikteIjs==0);
                   echo 
    "Dikte van het ijs:$dikteIjs";
                   echo 
    "<p><img src="afbeeldingen/succes.png" alt="succes" title="succes"/>Hoera, de Elfstedentocht kan doorgaan!</p>";
               }
               
               else{
                   echo 
    "Dikte van het ijs:,$dikteIjs";
                   echo 
    "<p><img src="afbeeldingen/helaas.png" alt="succes" title="succes"/>Helaas, het ijs is nog niet dik genoeg</p>";
               }
               }
              
            
    ?>
    : Click image for larger version. 

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    2 - if(empty($dikteIjs)==0){} echo empty($dikteIjs==0);


  5. #5
    Registered User
    Join Date: Mar:2009
    Location:
    Posts: 169
    PHP Code:
    echo empty($dikteIjs==0); 
    , a PHP 5.5 parse error.

    PHP Code:
    if(empty($dikteIjs)==0){ 
    empty().
    boolean - true ($dikteIjs) false.


    PHP Code:
    if(!empty($dikteIjs)) {
      
    // $dikteIjs is set and is not empty (not false, not 0, not empty string or empty array)
      // proceed doing stuff with $dikteIjs

    :
    PHP Code:
    $dikteIjs filter_input(INPUT_POST"dikte"); 
    empty() , $dikteIjs :
    PHP Code:
    if($dikteIjs) {
      
    // $dikteIjs has a value other than false, 0 or empty string


  6. #6
    Registered User tedych's Avatar
    Join Date: Nov:2003
    Location:
    Posts: 17,654
    , .
    if (isset($_POST['dikte'])) {...}
    true dikte NULL.
    empty() , true, '0', 0, , ...
    hidden <input type="hidden" name="action" value="submit"> , ( ).
    if (($_POST['action'] ?? '') === 'submit') .... PHP 7+.

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