php 利用GD创建缩略图

<?php

    error_reporting(E_ALL);

    $width = 80;

    /*** the image file to thumbnail ***/
    $image = 'spork.jpg';

    if(!file_exists($image))
    {
        echo 'No file found';
    }
    else
    {
        /*** image info ***/
        list($width_orig, $height_orig, $image_type) = getimagesize($image);

        /*** check for a supported image type ***/
        if($image_type !== 2)
        {
            echo 'invalid image';
        }
        else
        {
            /*** thumb image name ***/
            $thumb = 'thumb.jpg';

            /*** maintain aspect ratio ***/
            $height = (int) (($width / $width_orig) * $height_orig);

            /*** resample the image ***/
            $image_p = imagecreatetruecolor($width, $height);
            $image = imageCreateFromJpeg($image);
            imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

            /*** write the file to disc ***/
            if(!is_writeable(dirname($thumb)))
            {
                echo 'unable to write image in ' . dirname($thumb);
            }
            else
            {
                imageJpeg($image_p, $thumb, 100);
            }
        }
    }
?>

<?php

try
{
    /*** Read in the animated gif ***/
    $animation = new Imagick("animation.gif");

    /*** Loop through the frames ***/
    foreach ($animation as $frame)
    {
        /*** Thumbnail each frame ***/
        $frame->thumbnailImage(100, 100);
   
        /*** Set virtual canvas size to 100x100 ***/
        $frame->setImagePage(100, 100, 0, 0);
    }

    /*** Write image to disk. Notice writeImages instead of writeImage ***/
    $animation->writeImages("animation_thumbnail.gif");

    echo "Images written";
}
catch(Exception $e)
{
    echo $e->getMessage();
}

?>

 <?php
    /**
    *
    * Validate a date
    *
    * @param    string    $date
    * @param    string    format
    * @return    bool
    *
    */
    function validateDate( $date, $format='YYYY-MM-DD')
    {
        switch( $format )
        {
            case 'YYYY/MM/DD':
            case 'YYYY-MM-DD':
            list( $y, $m, $d ) = preg_split( '/[-./ ]/', $date );
            break;

            case 'YYYY/DD/MM':
            case 'YYYY-DD-MM':
            list( $y, $d, $m ) = preg_split( '/[-./ ]/', $date );
            break;

            case 'DD-MM-YYYY':
            case 'DD/MM/YYYY':
            list( $d, $m, $y ) = preg_split( '/[-./ ]/', $date );
            break;

            case 'MM-DD-YYYY':
            case 'MM/DD/YYYY':
            list( $m, $d, $y ) = preg_split( '/[-./ ]/', $date );
            break;

            case 'YYYYMMDD':
            $y = substr( $date, 0, 4 );
            $m = substr( $date, 4, 2 );
            $d = substr( $date, 6, 2 );
            break;

            case 'YYYYDDMM':
            $y = substr( $date, 0, 4 );
            $d = substr( $date, 4, 2 );
            $m = substr( $date, 6, 2 );
            break;

            default:
            throw new Exception( "Invalid Date Format" );
        }
        return checkdate( $m, $d, $y );
    }
?>

Example Usage

<?php
        echo validateDate( '2007-04-21' ) ? 'good'. " " : 'bad' . " ";
        echo validateDate( '2007-21-04', 'YYYY-DD-MM' )  ? 'good'. " " : 'bad' . " ";
        echo validateDate( '2007-21-04', 'YYYY/DD/MM' )  ? 'good'. " " : 'bad' . " ";
        echo validateDate( '21/4/2007', 'DD/MM/YYYY' )  ? 'good'. " " : 'bad' . " ";
        echo validateDate( '4/21/2007', 'MM/DD/YYYY' )  ? 'good'. " " : 'bad' . " ";
        echo validateDate( '20070421', 'YYYYMMDD' )  ? 'good'. " " : 'bad' . " ";
        echo validateDate( '04212007', 'YYYYDDMM' )  ? 'good'. " " : 'bad' . " ";
?>

<?php
/*** an array of attributes about a dog ***/
$array = array('animal'=>'dog', 'name'=>'Offenbach', 'owner'=>'Mr Smith');

/*** add the dogs favourite food to the array ***/
$array = ($array, 'food', 'postmans leg');

/*** print the array ***/
print_r($array);

/**
 * @Push and element onto the end of an array with associative key
 *
 * @param array $array
 *
 * @string $key
 *
 * @mixed $value
 *
 * @return array
 *
 */
function ($array, $key, $value){
 $array[$key] = $value;
 return $array;
}

?>

This will return the following results

Array
(
   [animal] => dog
   [name] => Offenbach
   [owner] => Mr Smith
   [food] => postmans leg
)

我在学习PHP的，当我尝试做在session_start（） - 获取有关错误信息不能发送会话cookie。

我看到在这个问题上前面的问题，但是，仍然不能确定我的错误。

如果是错误家伙？
<?php
session_start();
      if ($_POST['add'])
      {
            foreach ($_POST['a_qty'] as $k => $v)
            {
                  $_SESSION['cart'][$k] = $_SESSION['cart'][$k] + $v;
            }
      }
?>
<?php
// look for catalog file
      $catalogfile = "catalog.dat";
      // file is avaialbe, extract data from it and place into $catalog, with sku as key
      if (file_exists($catalogfile))
      {
            $data = file($catalogfile);
            foreach ($data as $line)
            {
                  $lineArray = explode(":", $line);
                  $sku = trim($lineArray[0]);
                  $CATALOG[$sku]['desc'] = trim($lineArray[1]);
                  $CATALOG[$sku]['price'] = trim($lineArray[2]);                             
            }
      }
      else
      {
            die("Could not find the catalog file");
      }
?>
<table border="1" cellspacing="10">
<?php
            // print items from the catalog for selection
            foreach ($CATALOG as $k => $v)
            {
                  echo "<tr><td colspan=2 width=750>";
                  echo "<b>" . $v['desc'] . "</b>";
                  echo "</td></tr>";
                  echo "<tr><td>";
                  echo "Price per unit: " . $CATALOG[$k]['price'];
                  echo "</td><td>Quantity: ";
                  echo "<input size=4 type=text name="a_qty[" . $k . "]">";
                  echo "</td></tr> ";
            }
?>