我正在使用以下 php 脚本在我的网站上显示随机图像，它效果很好，除了它会抓取我不希望它抓取的图像，所以我想在脚本中添加一个检查，以便它只会抓取以字母"TN-"开头的图像，但我不是 php 编码员，所以我想我会问这里的专家以获得一些帮助。
<?php
// files to search for
$extList = array();
$extList['gif'] = 'image/gif';
$extList['jpg'] = 'image/jpeg';
$extList['jpeg'] = 'image/jpeg';
$extList['png'] = 'image/png';
// set to specific image if needed
// null will result in a random image
$img = null;
// path to the directory you want to scan
$directory = './';
if (substr($directory,-1) != '/') {
$directory = $directory.'/';
}
// if img is set, show it
if (isset($_GET['img'])) {
$imageInfo = pathinfo($_GET['img']);
if (
isset( $extList[ strtolower( $imageInfo['extension'] ) ] ) &&
file_exists( $directory.$imageInfo['basename'] )
) {
$img = $directory.$imageInfo['basename'];
}
}
// if img isnt set, grab a random
else {
//cycle through directory and subfolders
$it = new RecursiveDirectoryIterator("$directory");
foreach(new RecursiveIteratorIterator($it) as $file)
{
$file_info = pathinfo($file);
if (
isset( $extList[ strtolower( $file_info['extension'] ) ] )
) {
$items[] = $file;
}
}
sort($items);
// get the random image
if (count($items) > 0) {
$imageNumber = time() % count($items);
$img = $directory.$items[$imageNumber];
}
}
// if img isnt null, display it
if ($img!=null) {
$imageInfo = pathinfo($img);
$contentType = 'Content-type: '.$extList[ $imageInfo['extension'] ];
header ($contentType);
readfile($img);
}
// else, try to create one or give error
else {
if ( function_exists('imagecreate') ) {
header ("Content-type: image/png");
$im = @imagecreate (100, 100)
or die ("Cannot initialize new GD image stream");
$background_color = imagecolorallocate ($im, 255, 255, 255);
$text_color = imagecolorallocate ($im, 0,0,0);
imagestring ($im, 2, 5, 5, "IMAGE ERROR", $text_color);
imagepng ($im);
imagedestroy($im);
}
}
?>
您可以在脚本中从第 32 行开始的块中添加检查：
//cycle through directory and subfolders
$it = new RecursiveDirectoryIterator("$directory");
foreach(new RecursiveIteratorIterator($it) as $file)
{
$file_info = pathinfo($file);
if (
isset( $extList[ strtolower( $file_info['extension'] ) ] ) &&
strpos( $file_info['basename'], 'TN-') === 0
) {
$items[] = $file;
}
}