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:
    * <IMG SRC="button.php3?button=yellow&text=Example">
    * 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 ]===

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