Question

OK I am sending data with $_POST to itself.
I have some checkboxes that I have checked by default. (1 & 2 in this example)
When the form is sumbitted I want to override these default’s with the $_POST value.

<?php
    $syndication_check_1 = 'checked="checked"';
    $syndication_check_2 = 'checked="checked"';
    $syndication_check_3 = '';
    if (isset($_POST['syndication'])) {
        //
    }
?>

<form name="form" method="post" action="">
    <!-- this is what I use for radiobuttons -->
    <legend>Sex:</legend>
    <input type="radio" name="sex" id="sex-1" value="M" <?php echo (!isset($_POST['sex']) || $_POST['sex'] == "M") ? 'checked="checked"': ''; ?> />
    <label for="sex-1"><?= _("Male"); ?></label>
    <input type="radio" name="sex" id="sex-2" value="F" <?php echo (isset($_POST['sex']) && $_POST['sex'] == "F") ? 'checked="checked"': ''; ?> />
    <label for="sex-2"><?= _("Female"); ?></label>

    <!-- now something similar for checkboxes -->
    <legend>Syndication:</legend>
    <input type="checkbox" name="syndication[]" id="syndication-1" value="yahoo" <?= $syndication_check_1; ?> /> <!-- checked -->
    <label for="syndication-1">Yahoo Real Estate</label>
    <input type="checkbox" name="syndication[]" id="syndication-2" value="trulia" <?= $syndication_check_2; ?> /> <!-- checked -->
    <label for="syndication-2">Trulia.com</label>
    <input type="checkbox" name="syndication[]" id="syndication-3" value="zillow" <?= $syndication_check_3; ?> />
    <label for="syndication-3">Zillow.com</label>
</form>

Answer 1

Id probably do something like this…

$syndicationCheck = array(
  'yahoo' => null,
  'trulia' => null,
  'zillow' => null
);

if(isset($_POST['syndication'])){
  foreach($_POST['syndication'] as $value){
    $syndicationCheck[$value] = 'checked';
  }
}


<legend>Syndication:</legend>
    <input type="checkbox" name="syndication[]" id="syndication-1" value="yahoo" <?= $syndicationCheck['yahoo']; ?> /> <!-- checked -->
    <label for="syndication-1">Yahoo Real Estate</label>
    <input type="checkbox" name="syndication[]" id="syndication-2" value="trulia" <?= $syndicationCheck['trulia']; ?> /> <!-- checked -->
    <label for="syndication-2">Trulia.com</label>
    <input type="checkbox" name="syndication[]" id="syndication-3" value="zillow" <?= $syndicationCheck['zillow']; ?> />
    <label for="syndication-3">Zillow.com</label>