通过文字传递创建的图形按钮

通过文字传递创建的图形按钮,详细说明请看文内英文说明
<?php Header( "Content-type: image/gif"); // info for the browser
/* PHP3 Button generator, (c) 2000 by IzzySoft (izzysoft@buntspecht.de)

• License: GPL (and it would be nice to drop me a note that you find it
• useful - if you use it. And, of course, I am very interested in
• enhancements you made to the script!
• Purpose: generate buttons with text passed by parameter.
• possible parameters to the script:
  button- input gif image. Just the part of the filename before the dot.
  The specified image file is expected in the same directory
  as this script resides in.
  font - font to use (1 - 5; 1 is very small, 3 medium, 5 normal size.
  The script will automatically use a smaller font if text is
  too long for selected size.) Default: 5
  text - the text to be put on the button. Will be centered.
  textcolor - color for the letters. Default: white.
  in this example code only blue, white and black are defined;
  but you can add custom colors easily.
  width,heigth - width and heigth of the button. Useful only if target
  button should have different size than source image.
• Example for usage:
• 
• will look for yellow.gif and put the string "Example" on it.
• I use to have three buttons I normally generate (one displays selected
• item, one is for mouseover(), and one is the default button). The source
• images are yellow.gif, white.gif and blue.gif - so my script assumes
• blue.gif as default if "button=" not specified - you may wish to change
• this below, it's easy ;)
  */
  // ===========================[ check fo
  // r parameters and/or set defaults ]===
  if (($font == "") || ($font > 5) || ($font < 1)) { $font = 5; }
  if ($text == "") { $text="Moin!"; }// button text
  if ($textcolor == "") {// color for the letters
  switch ($button) {
  case "yellow":
  case "white":
  $textcolor = "black";
  break;
  default:
  if ($button == "") { $button = "blue"; }
  $textcolor = "white";
  break;
  }
  } // textcolor end
  $im_info = getimagesize("$button.gif"); // button size
  if ($width == "") {
  if ($im_info == "") {
  $buttonwidth = 125;
  } else {
  $buttonwidth = "$im_info[0]";
  }
  } else {
  $buttonwidth = $width;
  }
  if ($heigth == "") {
  if ($im_info == "") {
  $buttonheigth = 30;
  } else {
  $buttonheigth = "$im_info[1]";
  }
  } else {
  $buttonheigth = $heigth;
  }
  $vmidth = ceil($buttonheigth / 2);
  // =====================================
  // ===[ now lets define some colors ]===

$white = "255,255,255";   
$black = "0,0,0";   
$blue = "0x2c,0c6d,0xaf";   
// =====================================   
//     =============[ build color array ]===   
// now we put the needed color into an a   
//     rray (if e.g. "$textcolor=white",   
// the array $textcolor_array represents   
//     "white")   
$textcolor_array = explode(",", $$textcolor);   
// =======================[ calculate po   
//     sition of the text on the button ]===   
do {   
$textwidth = strlen($text) * imagefontwidth($font);   
$x = ($buttonwidth - $textwidth) / 2; $x = ceil($x);   
$y = $vmidth - (imagefontheight($font) / 2);   
$font--;   
} while (($x < 0) && ($font > 0)); $font++;   
// =====================================   
//     ======[ now we create the button ]===   
if (isset($width) || isset($heigth)) {// size change expected?   
$ima = imagecreatefromgif("$button.gif");// open input gif   
$im = imagecreate($buttonwidth,$buttonheigth); // create img in desired size   
$uglybg = ImageColorAllocate($im,0xf4,0xb2,0xe5);   
ImageRectangle($im,0,0,$buttonwidth,$buttonheigth,$uglybg);   
$dummy = imagecopyresized($im,$ima,0,0,0,0,$buttonwidth,$buttonheigth,$im_info[0],$im_info[1]);   
if ($dummy == "") {   
ImageDestroy($im); // if it didn't work, create default below instead   
} else {;}   
ImageDestroy($ima);   
ImageColorTransparent($im,$uglybg);   
} else {   
$im = imagecreatefromgif("$button.gif");// open input gif   
}   
if ($im == "") { $im = imagecreate($buttonwidth,$buttonheigth); // if input gif not found,   
$rblue = ImageColorAllocate($im, 0x2c,0x6D,0xAF);// create a default box   
ImageRectangle($im,0,0,200,100,$rblue);   
}   
$color = ImageColorAllocate($im, $textcolor_array[0], $textcolor_array[1], $textcolor_array[2]); // allocate the color   
imagestring($im, $font, $x, $y, "$text", $color); // put the text on it   
ImageGif($im);// send button to browser   
ImageDestroy($im);// free the used memory   
?>