How to delete the title attribute of an image in php

With the continuous development of website development, front-end technologies such as Javascript, CSS, and HTML have become very mature, and back-end programming languages ​​have become more and more important. Among them, PHP is the most widely used and feature-rich back-end language.

In website development, it is often necessary to handle operations such as uploading and deleting images. When deleting images, we usually use PHP's unlink() function to delete the image files from the server file system. However, sometimes a problem occurs, that is, after deleting the image, the title attribute of the original image still exists in the front-end page. This problem requires us to take some measures to solve it.

In HTML, the title attribute of an image can be displayed as the mouse prompt text of the image, so it is very common in website design. When deleting images in PHP, we usually delete the image files directly and forget to delete the related attributes in the database or page together. This will result in some information of the deleted image still being visible on the page, such as title attributes, image size, etc.

Fortunately, it is not difficult to solve this problem. We only need to add some code to the PHP script. The following introduces two methods to delete the title attribute of an image.

Method 1:

<?php
$file = &#39;path/to/image.jpg&#39;;
if (file_exists($file)) {
    unlink($file);
    $img_name = basename($file);
    // 移除页面中对应图片元素的title属性
    echo "<script> document.querySelector('img[src=\"".$img_name."\"]').removeAttribute('title'); </script>";
}
?>

The principle of this method is that after the unlink() function successfully deletes the image file, the src attribute of the img element on the page is used to match whether it is the image file that was just deleted. , and then use JavaScript's removeAttribute() function to remove the title attribute of the image element.

Method 2:

<?php
$file = &#39;path/to/image.jpg&#39;;
if (file_exists($file)) {
    unlink($file);
    $img_name = basename($file);
    // 修改数据库中对应图片的title属性为null
    $stmt = $pdo->prepare("UPDATE images SET title=NULL WHERE filename=?");
    $stmt->execute([$img_name]);
}
?>

The principle of this method is that after the unlink() function successfully deletes the image file, use PDO to query the record of the corresponding image from the database, and then set the title attribute is null. In this way, the title attribute that displays the corresponding image on the page will no longer exist.

It should be noted that using the second method requires that the corresponding image record exists in the database, while the first method does not. In addition, the second method requires database support and ensures that the link between the database and PHP has been correctly established.

Summary:

When deleting images in PHP, we need to remember to also delete the title attribute of the image on the page or the record in the database, otherwise it may cause potential security risks or page display question. The two methods introduced above can easily solve this problem. I hope it will be helpful to everyone.

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