本文实例讲述了PHP动态生成指定大小随机图片的方法。分享给大家供大家参考,具体如下:
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<?php
$image_width = 100;
$image_height = 100;
$image_str = '' ;
if (isset( $_GET [ 'w' ]))
{
$image_width = intval ( $_GET [ 'w' ]);
}
if (isset( $_GET [ 'h' ]))
{
$image_height = intval ( $_GET [ 'h' ]);
}
if (isset( $_GET [ 's' ]))
{
$image_str = $_GET [ 's' ];
}
$img = imagecreate( $image_width , $image_height );
$color = imagecolorallocate( $img , mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
imagefilledrectangle( $img , 0, $image_height , $image_width , 0, $color );
$step = mt_rand(15, 30);
$start = mt_rand(0, $step );
$color = imagecolorallocate( $img , mt_rand(200,255), mt_rand(200,255), mt_rand(200,255));
imagesetthickness( $img , mt_rand(3, 10));
if ( $image_height > $image_width )
{
for ( $i = $start ; $i < $image_height * 2; $i += $step )
{
imageline( $img , 0, $i , $i , 0, $color );
}
}
else
{
for ( $i = $start ; $i < $image_width * 2; $i += $step )
{
imageline( $img , $i , 0, 0, $i , $color );
}
}
if ( $image_str != '' )
{
$black = imagecolorallocate( $img , 0, 0, 0);
imagestring( $img , 12, 5, 5, $image_str , $black );
}
header( 'Content-type:image/png' );
imagepng( $img );
imagedestroy( $img );
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希望本文所述对大家PHP程序设计有所帮助。