Unzip Files

<?php
$zip = zip_open("zip.zip");
if (is_resource($zip)) {
  while ($zip_entry = zip_read($zip)) {
    $fp = fopen("zip/".zip_entry_name($zip_entry), "w");
    if (zip_entry_open($zip, $zip_entry, "r")) {
      $buf = zip_entry_read($zip_entry, zip_entry_filesize($zip_entry));
      fwrite($fp,"$buf");
      zip_entry_close($zip_entry);
      fclose($fp);
    }
  }
  zip_close($zip);
}
?>

 

URL Validation

$url = 'http://example.com';
$validation = filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_HOST_REQUIRED);

if ( $validation ) $output = 'proper URL';
else $output = 'wrong URL';

echo $output;

 

Update Values of Entire Table

This code assumes you are connected to a MySQL database which has a table with Names and Emails. The idea is that it will output a table of every single value from that table, as text inputs. You can then alter the values of these inputs and re-submit, updating all the values in the database.

//get data from db
$sql = mysql_query("SELECT * FROM table");
$count=mysql_num_rows($sql);

//start a table
echo '<form name="form1" method="post" action="">
<table width="292" border="0" cellspacing="1" cellpadding="0">';

//start header of table
echo '<tr>
<th>&nbsp;</th>
<th>Name</th>
<th>Email</th>
</tr>';

//loop through all results
while($r=mysql_fetch_object($sql)){

//print out table contents and add id into an array and email into an array
echo '<tr>
<td><input type="hidden" name="id[]" value='.$r->id.' readonly></td>
<td>'.$r->name.'</td>
<td><input name="email[]" type="text" id="price" value="'.$r->email.'"></td>
</tr>';
}

//submit button
echo'<tr>
<td colspan="3" align="center"><input type="submit" name="Submit" value="Submit"></td>
</tr>
</table>
</form>';

// if form has been submitted, process it
if($_POST["Submit"])
{
       // get data from form
       $name = $_POST['name'];
       // loop through all array items
   foreach($_POST['id'] as $value)
       {
       // minus value by 1 since arrays start at 0
               $item = $value-1;
               //update table
       $sql1 = mysql_query("UPDATE table SET email='$email[$item]' WHERE id='$value'") or die(mysql_error());
   }

// redirect user
$_SESSION['success'] = 'Updated';
header("location:index.php");
}

Submitted values are not cleaned in this example, as it is assumed only an admin would have access to this type of powerful entry system.

Variable Variables

<?php

  $var1 = 'nameOfVariable';

  $nameOfVariable = 'This is the value I want!';

  echo $$var1; 

?>

 

Zero Padded Numbers

function getZeroPaddedNumber($value, $padding) {
       return str_pad($value, $padding, "0", STR_PAD_LEFT);
}

Usage

echo getZeroPaddedNumber(123, 4);
// outputs "0123"

POST Validation Loop

Assumptions

You have an HTML form with a variety of inputs. The action attribute of the form points to a PHP file that contains the code below.

Notes about code

This code starts by creating an array that holds the name of various inputs being submitted via a POST. getFormData() is then called, where the required fields are passed in. Inside the function an array is created to hold various pieces of data related to the form. $formData['valid'] is a boolean referencing if all data was provided and valid, $formData['fields'] is an array keyed by the name of the input with their respective value from the POST data, $formData['notValidFields'] is an array that will contain the names of any inputs that were not passed or that had non-valid data.
This logic can be easily extended with regular expressions to check for stricter data, such as email addresses and urls.

<?php

$requiredFields = array('field1', 'field2', 'field3', 'field4');
$formData = getFormData($requiredFields);

function getFormData($requiredFields){
       $formData = array();
       $formData['valid'] = true;
       $formData['fields'] = array();
       $formData['notValidFields'] = array();

       for($a = 0; $a < count($requiredFields); $a++){
               $field = $requiredFields[$a];
               if(isset($_POST[$field])){
                       $value = $_POST[$field];
                       if(empty($value)){
                               $formData['valid'] = false;
                               $formData['notValidFields'][] = $field;
                       }else{
                               $formData['fields'][$field] = $value;
                       }
               }else{
                       $formData['valid'] = false;
                       $formData['notValidFields'][] = $field;
               }
       }
       return $formData;
}

PHP Redirect

<?php
  header( 'Location: http://www.yoursite.com/new_page.html' ) ;
?>