php替换img中src内容的方法是:可以通过preg_replace()函数来实现。该函数用于执行一个正则表达式的搜索和替换。具体使用方法:【preg_replace($rule,'
,$content')】。
函数介绍:
(推荐教程:php教程)
preg_replace 函数执行一个正则表达式的搜索和替换。
函数语法:
mixed preg_replace(mixed $pattern, mixed $replacement, mixed $subject[, int $limit = -1[, int &$count]])
搜索 subject 中匹配 pattern 的部分, 以 replacement 进行替换。
参数说明:
$pattern: 要搜索的模式,可以是字符串或一个字符串数组。
$replacement: 用于替换的字符串或字符串数组。
$subject: 要搜索替换的目标字符串或字符串数组。
$limit: 可选,对于每个模式用于每个 subject 字符串的最大可替换次数。 默认是-1(无限制)。
$count: 可选,为替换执行的次数。
返回值:
如果 subject 是一个数组, preg_replace() 返回一个数组, 其他情况下返回一个字符串。
如果匹配被查找到,替换后的 subject 被返回,其他情况下 返回没有改变的 subject。如果发生错误,返回 NULL。
代码实现:
/** * 图片地址替换成压缩URL * @param string $content 内容 * @param string $suffix 后缀 */ function get_img_thumb_url($content="",$suffix="/statics/images/product_2.jpg") { $pregRule = "/<[img|IMG].*?src=[\'|\"](.*?(?:[\.jpg|\.jpeg|\.png|\.gif|\.bmp]))[\'|\"].*?[\/]?>/"; $content = preg_replace($pregRule, '<img src="/static/imghwm/default1.png" data-src="'.$suffix.'" class="lazy" data-original="${1}" alt="How to replace src content in img in php" >', $content); return $content; }
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