imagechar

(PHP 4, PHP 5)

imagechar — 水平地画一个字符

说明

bool imagechar ( resource $image , int $font , int $x , int $y , string $c , int $color )

imagechar() 将字符串 c 的第一个字符画在 image 指定的图像中，其左上角位于 x ，y （图像左上角为 0, 0），颜色为 color 。如果 font 是 1，2，3，4 或 5，则使用内置的字体（更大的数字对应于更大的字体）。

Example#1 imagechar() 例子


<?php

$im = imagecreate(100,100);

$string = 'PHP';

$bg = imagecolorallocate($im, 255, 255, 255);
$black = imagecolorallocate($im, 0, 0, 0);

// prints a black "P" in the top left corner
imagechar($im, 1, 0, 0, $string, $black);

header('Content-type: image/png');
imagepng($im);

?>

参见 imagecharup() 和 imageloadfont()。

add a note User Contributed Notes
imagechar

sw at profilschmiede dot de
20-Jun-2005 11:35


For the sake of completeness, here is an example for imagechar. 

The base-image automatically adjusts to the size and the height of the given string. Using the rand()-function the y-position of each char is slightly varied with every loop-run. You can easily rewrite the script to use a randomly generated string - the one given here just serves as an example.



<?php



$string = '1 2 3 4 5 6 7 8 9 A B C D E F G';

$font_size = 5;

$width=imagefontwidth($font_size)*strlen($string);

$height=imagefontheight($font_size)*2;

$img = imagecreate($width,$height);

$bg = imagecolorallocate($img,225,225,225);

$black = imagecolorallocate($img,0,0,0);

$len=strlen($string);



for($i=0;$i<$len;$i++)

{

    $xpos=$i*imagefontwidth($font_size);

    $ypos=rand(0,imagefontheight($font_size));

    imagechar($img,$font_size,$xpos,$ypos,$string,$black);

    $string = substr($string,1);    

    

}

header("Content-Type: image/gif");

imagegif($img); 

imagedestroy($img);

?>

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imagecharup

imagearc

Last updated: Mon, 26 Nov 2007