213 lines
7.5 KiB
PHP
213 lines
7.5 KiB
PHP
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<?php
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namespace tcwei\smallTools;
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class GetImgSrc{
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/**
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* 提取HTML文章中的图片地址
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* @param string $data HTML或者文章
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* @param int $num 第 $num 个图片的src，默认为第一张
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* @param string $order 顺取倒取； 默认为 asc ，从正方向计数。 desc 从反方向计数
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* @param string|array $blacklist 图片地址黑名单，排除图片地址中包含该数据的地址；例如 传入 baidu.com 会排除 src="http://www.baidu.com/img/a.png"
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* @param string $model 默认为字符串模式;可取值 string preg；string模式处理效率高，PHP版本越高速度越快，可比正则快几倍
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* @return false| null | src 当data为空时返回 false ， src不存在时返回 null ，反之返回src
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*/
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public static function src($data, $num = 1, $order = 'asc', $blacklist = false, $model = 'string'){
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if(isset($data)){
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if($model === 'preg'){
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$imgSrc = self::pregModel($data, $num-1, $order);
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}else{
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$imgSrc = self::strModel($data, $num, $order);
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}
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if($blacklist === false){
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return $imgSrc;
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}else{
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if(is_array($blacklist)){
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foreach($blacklist as $value){
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if(strpos($imgSrc, $value) !== false){
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return self::src($data, $num+1, $order, $blacklist, $model);
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};
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}
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return $imgSrc;
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}else{
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if($blacklist === false || strpos($imgSrc, (string)$blacklist) === false){
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return $imgSrc;
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}else{
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return self::src($data, $num+1, $order, $blacklist, $model);
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}
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}
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}
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}else{
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return false;
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}
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}
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/**
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* 提取HTML文章中的图片地址
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* @param string $data HTML或者文章
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* @param int $startNum 默认为1，从第一张图片开始抽取
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* @param int $length 从 $startNum 开始抽取，共抽取 $length 张；默认为0，为0则抽取到最后
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* @param string $order 顺取倒取； 默认为 asc ，从正方向计数。 desc 从反方向计数
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* @param string|array $blacklist 图片地址黑名单，排除图片地址中包含该数据的地址；例如 传入 img.baidu.com 会排除 src="img.baidu.com/a.png"
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* @param string $model 抽取集合时，默认为正则模式；可选模式：preg string，当 $length > 3 或者 $length = 0时，强制使用正则模式，因为取的数量大时，正则速度更快。
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* @return array 图片地址的集合数组，若无则返回空数组
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*/
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public static function srcList($data, $startNum = 1, $length = 0, $order = 'asc', $blacklist = false, $model = 'preg'){
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if($model === 'preg' || $length > 3 || $length === 0){
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$imgSrcArr = self::pregModel($data, [$startNum-1, $length, $blacklist], $order);
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}else{
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$imgSrcArr = [];
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for($i=$startNum; $i<$startNum+$length; $i++){
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$imgSrc = self::strModel($data, $i, $order);
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if(is_array($blacklist)){
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$blackBool = true;
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foreach ($blacklist as $k=>$v){
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if (strpos($imgSrc, $blacklist) !== false) {
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$blackBool = false;
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}
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}
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if($blackBool){
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$imgSrcArr[] = $imgSrc;
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}else{
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$length++;
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}
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}else{
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if ($blacklist === false || strpos($imgSrc, (string)$blacklist) === false) {
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$imgSrcArr[] = $imgSrc;
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}else{
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$length++;
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}
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}
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}
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}
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return $imgSrcArr;
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}
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/**
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* @param $str
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* @param $num
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* @param $order
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* @return bool|string|null
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*/
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public static function strModel($str, $num, $order){
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$topStr = null;
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if($order != 'asc'){
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$funcStr = 'strrpos';
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}else{
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$funcStr = 'strpos';
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}
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for($i=1; $i<=$num; $i++){
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$firstNum = $funcStr($str, '<img');
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if($firstNum !== false){
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if($order != 'asc'){
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$topStr = $str;
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$str = substr($str, 0, $firstNum);
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}else{
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$str = substr($str, $firstNum+4);
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}
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}else{
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return null;
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}
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}
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$str = $order=='asc'?$str:$topStr;
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$firstNum1 = $funcStr($str, 'src=');
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$type = substr($str, $firstNum1+4, 1);
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$str2 = substr($str, $firstNum1+5);
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if($type == '\''){
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$position = strpos($str2, "'");
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}else{
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$position = strpos($str2, '"');
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}
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$imgPath = substr($str2, 0, $position);
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return $imgPath;
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}
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/**
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* @param $str
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* @param $num
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* @param $order
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* @return string|array|null
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*/
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public static function pregModel($str, $num, $order){
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preg_match_all("/<img.*>/isU", $str, $ereg);
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$img = $ereg[0];
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if($order != 'asc'){
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$img = array_reverse($img);
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};
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if(is_array($num)){
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$startNum = $num[0];
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$length = $num[1];
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$blacklist = $num[2];
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$imgSrcArr = [];
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foreach($img as $key=>$value){
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$imgSrc = $value;
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$pregModel='/src=(\'|")(.*)(?:\1)/isU';
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preg_match_all($pregModel, $imgSrc, $img1);
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if(is_array($blacklist)){
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$blacklistBool = true;
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foreach($blacklist as $v){
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if(strpos($img1[2][0], $v) !== false){
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$blacklistBool = false;
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};
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}
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if($blacklistBool){
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$imgSrcArr[] = $img1[2][0];
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};
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} else {
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if ($blacklist === false || strpos($img1[2][0], (string)$blacklist) === false) {
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$imgSrcArr[] = $img1[2][0];
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};
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}
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}
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if($length > 0){
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return array_slice($imgSrcArr, $startNum, $length);
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}else{
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return array_slice($imgSrcArr, $startNum);
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}
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}else{
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if(!empty($img[$num])){
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$imgStr = $img[$num];
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$pregModel='/src=(\'|")(.*)(?:\1)/isU';
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preg_match_all($pregModel, $imgStr, $img1);
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return $img1[2][0];
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}else{
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return null;
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}
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}
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}
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}
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/*
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$str = '<div>
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<p>这里是普通文字</p>
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<p>这里是干扰元素测试\'\'"""</p>
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<img src="src1.png"/>
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<img src=\'src2.png\'/>
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<img src="src3.jpg"/>
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<img src="src4.jpg"/>
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<img src="src5.jpg"/>
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</div>';
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$src = GetImgSrc::srcList($str, 2, 3, 'asc', false, 'string');
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$src2 = GetImgSrc::src($str, 1, 'asc', false, 'string');
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var_dump($src);
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var_dump($src2);
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*/
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?>
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