How To Validate Height and Width of Image in PHP

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Inside this article we will see the concept i.e How to validate height and width of image in PHP. In several cases while development we need to validate file upload either with it’s size, file extension, height, width, etc.

This article contains classified information about file validation with height and width. This tutorial will be super easy to understand and it’s steps are easier to implement in your code as well.

The getimagesize() function in PHP is an inbuilt function which is used to get the size of an image.

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Let’s get started.


Create an Application

Create a folder php-upload in your localhost directory.

Inside this folder, create a file called index.php.

<!DOCTYPE html>
<html lang="en">

<head>
    <title>How To Validate Height and Width of Image in PHP</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">

    <?php
    if (isset($_POST['btnsubmit'])) {
        // form submitted
        list($width, $height) = getimagesize($_FILES['file']['tmp_name']);

        $valid_extensions = [
            "image/png",
            "image/jpg",
            "image/jpeg"
        ];
        if (
            $width <= 400 && 
            $height <= 200 && 
            in_array($_FILES['file']['type'], $valid_extensions) &&
            $_FILES['file']['size'] <= 13000) {

                // validating width, height, file extension and size
                // 13000 is in bytes and KB it is 13 Kb

                //.. do code
        }else{
           // handle error here
        }
    }
    ?>
</head>

<body>

    <div class="container">
        <h2>Upload Form</h2>
        <form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="post" enctype="multipart/form-data">
            <div class="form-group">
                <label for="name">Name:</label>
                <input type="text" class="form-control" id="name" placeholder="Enter name" name="name">
            </div>
            <div class="form-group">
                <label for="file">Upload File:</label>
                <input type="file" class="form-control" name="file">
            </div>
            <button type="submit" class="btn btn-primary" name="btnsubmit">Submit</button>
        </form>
    </div>

</body>

</html>
  • getimagesize() is a PHP function which returns file attributes when we pass file path into it. We are getting height and width from it.
  • $width <= 400, It is 400px. According to given condition width should be less than or equal to 400px.
  • $height <= 200, It is 200px.
  • in_array($_FILES[‘file’][‘type’], $valid_extensions) Checking file type with given image extensions.
  • $_FILES[‘file’][‘size’] <= 13000 Condition to check file size. Here 13000 is in bytes, so it is 13Kb.

Application Testing

Open browser and hit this URL: http://localhost/php-upload

We hope this article helped you to learn How To Validate Height and Width of Image in PHP Tutorial in a very detailed way.

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