18c01-1.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 64 行

<?php
// We are going to insert a copyright statement onto a graphic.
// Read the graphic into memory, this is a JPEG so we use that function:
$gfx = imagecreatefromjpeg('eli.jpg');

// Now, we want to place this statement at the bottom
// so we need to determine the dimensions of our image:
$width = imagesx($gfx);
$height = imagesy($gfx);

// Define our string we are going to print:
$statement = 'Copyright 2006 - eliw.com';

// We are going to use the basic built-in monospace fonts to write with:
// We would like to use font size of 3.  However, if that ends up being
// too wide for our image, we need to go smaller.  Therefore let's be
// smart and do some testing on various font sizes:
foreach (range(3, 1) as $fontsize) {
    // Calculate the width of a single character of this font:
    $fontw = imagefontwidth($fontsize);

    // Calculate the full width of this statement.
    $fullw = strlen($statement) * $fontw;

    // Is this, plus 4 to give spacing, less than our image?
    if ($fullw + 4 <= $width) {
        // Yay, it is.  Break out of this loop and continue with this size.
        break;
    }
}

// We need to know the height of a character of this font.
$fonth = imagefontheight($fontsize);

// We want two colors for this.  We need to display a black background
// and want white text on top of that.  Declare those colors via RGB:
$black = imagecolorallocate($gfx, 0, 0, 0);
$white = imagecolorallocate($gfx, 255, 255, 255);

// We are placing our text in the bottom right corner and we want to leave
// a 2 pixel space around our text, but need the black box to hit the edges
// of the image.  Therefore, draw the rectangle big enough to hold it.
imagefilledrectangle($gfx, // The graphics object to draw on
    $width - $fullw - 4,  // The X value of upper left corner
    $height - $fonth - 4, // The Y value of upper left corner
    $width,               // The X value of lower right corner
    $height,              // The Y value of lower right corner
    $black);              // The color

// Now, print this statement out in the bottom right corner.
imagestring($gfx,         // The graphics object to draw on
    $fontsize,            // The font size to use.
    $width - $fullw - 2,  // X value of upper left corner
    $height - $fonth - 2, // Y value of upper left corner
    $statement,           // The text to print
    $white);              // The color to do it with.
    
// We are now done with our manipulations.
// Let the browser know that we are going to output this as a PNG
header('Content-type: image/png');

// And then output our new image:
imagepng($gfx);
?>