How to Safely Insert Image Blobs into MySQL Databases using PHP?

Inserting Blobs into MySql Databases with PHP

Issue

Inserting images into a MySQL database using PHP can be tricky. One common mistake is to directly embed the binary data using file_get_contents(). Doing so results in a string representing the function call being stored instead of the actual image data.

Solution 1: Variable Concatenation

To properly insert the image data, you need to concatenate the result of file_get_contents(). This can be done by jumping out of the string and explicitly appending the value:

$sql = "INSERT INTO ImageStore(ImageId,Image) VALUES('$this->image_id','" . file_get_contents($tmp_image) . "')";

Solution 2: Sanitization

Binary data may contain special characters that can invalidate the SQL query. To prevent this, escape the data using mysql_escape_string():

$sql = "INSERT INTO ImageStore(ImageId,Image) VALUES('$this->image_id','" . mysql_escape_string(file_get_contents($tmp_image)) . "')";

Solution 3: Separate Storage

Storing large images in a database can lead to performance issues. Consider using a separate file storage system, such as Amazon S3 or a file system, and storing the image path or reference in the database instead.

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