PHP Check If File Is an Image

PHP check if file is an image

Native way to get the mimetype:

For PHP < 5.3 use mime_content_type()

For PHP >= 5.3 use finfo_open() or mime_content_type()

Alternatives to get the MimeType are exif_imagetype and getimagesize, but these rely on having the appropriate libs installed. In addition, they will likely just return image mimetypes, instead of the whole list given in magic.mime.

While mime_content_type is available from PHP 4.3 and is part of the FileInfo extension (which is enabled by default since PHP 5.3, except for Windows platforms, where it must be enabled manually, for details see here).

If you don't want to bother about what is available on your system, just wrap all four functions into a proxy method that delegates the function call to whatever is available, e.g.

function getMimeType($filename)
{
    $mimetype = false;
    if(function_exists('finfo_open')) {
        // open with FileInfo
    } elseif(function_exists('getimagesize')) {
        // open with GD
    } elseif(function_exists('exif_imagetype')) {
       // open with EXIF
    } elseif(function_exists('mime_content_type')) {
       $mimetype = mime_content_type($filename);
    }
    return $mimetype;
}

PHP, HTML check if file is an image

So the checking file type by name or extension is not good, because you can easily change it by plain remane function. You can check if uploaded file is an image using e.g. mime type. In php you have function mime_content_type(). Example of usage:

$imageMimeTypes = array(
    'image/png',
    'image/gif',
    'image/jpeg');

$fileMimeType = mime_content_type($_FILES['UPLFILE2']['tmp_name']);

if (in_array($fileMimeType, $imageMimeTypes)) {
    //passed validation 
}

Of course you can define more mime types of images.

PHP: How to check if image file exists?

You need the filename in quotation marks at least (as string):

if (file_exists('http://www.mydomain.com/images/'.$filename)) {
 … }

Also, make sure $filename is properly validated. And then, it will only work when allow_url_fopen is activated in your PHP config

Check if file is image or pdf

I like this approach it saves a bit of typing

return (in_array($file['content-type'], ['image/jpg', 'application/pdf']));

php file upload check if file is an image

May be it will help you,

if(!empty($_FILES['img'])) {
    $img = $_FILES['img'];

    foreach($img['name'] as $key => $name) {
        $type = $img['type'][ $key ];
        $type = strtolower($type);
        if($type == 'image/jpg' || $type == 'image/jpeg' || $type == 'image/png' || $type == 'image/gif'){
            $newname = date('YmdHis',time()).mt_rand().'.jpg';
            $stmt = $conn->prepare("INSERT INTO gallery (imgsrc, title, description) VALUES (?, ?, ?)");
            $stmt->bind_param("sss", $newname, $_POST['imgtitle'], $_POST['imgdesc']);
            if($stmt->execute()) {
                move_uploaded_file($img['tmp_name'][ $key ],'../../images/'.$newname);
            }
        }
    }

    header("location: ../");
}

How to check if image file inputed or not in PHP?

Replace this part of your PHP code

if(!empty($_FILES['profile_image'])){

    #then execute this code when there is image uploaded
}else{
    #execute this
}

with this

if (is_uploaded_file($_FILES ['profile_image'] ['tmp_name'])) {
    #then execute this code when there is image uploaded
} else {
    #execute this
}

And this part of your HTML code

<form  method='POST' action='update.PHP'>

with this

<form  method='POST' action='update.PHP' enctype='multipart/form-data'>

the most reliable way to check upload file is an image

finfo_* library would be good but it will work with >= 5.3.0 versions,

AND getimagesize() GD library function that is return image info WxH and size

if image invalid then getimagesize() show warning so better to use to validate image using finfo_* function,

you can also do for cross version code, see below sample code

<?php 
$file = $_FILES['photo'];
$whitelist_type = array('image/jpeg', 'image/png','image/gif');
$error = null;
if(function_exists('finfo_open')){    //(PHP >= 5.3.0, PECL fileinfo >= 0.1.0)
   $fileinfo = finfo_open(FILEINFO_MIME_TYPE);

    if (!in_array(finfo_file($fileinfo, $file['tmp_name']), $whitelist_type)) {
      $error[]  = "Uploaded file is not a valid image";
    }
}else if(function_exists('mime_content_type')){  //supported (PHP 4 >= 4.3.0, PHP 5)
    if (!in_array(mime_content_type($file['tmp_name']), $whitelist_type)) {
      $error[]  = "Uploaded file is not a valid image";
    }
}else{
   if (!@getimagesize($file['tmp_name'])) {  //@ - for hide warning when image not valid
      $error[]  = "Uploaded file is not a valid image";
   }
}

---

Related Topics