I need to verify string whether the string is image file name.
$aaa = 'abskwlfd.png';
if ($aaa is image file) {
echo 'it's image';
else {
echo 'not image';
}
How do i do that? It will chck 100 images, so it should be fast. I know there is a filetype verification method, but I think that's slow.. What about preg_match? Is it faster? I'm not good at preg_match.
Thank you in advance.
Try this:
<?php
$supported_image = array(
'gif',
'jpg',
'jpeg',
'png'
);
$src_file_name = 'abskwlfd.PNG';
$ext = strtolower(pathinfo($src_file_name, PATHINFO_EXTENSION)); // Using strtolower to overcome case sensitive
if (in_array($ext, $supported_image)) {
echo "it's image";
} else {
echo 'not image';
}
?>
strtolower to ensure case-insensitive.
strtolower added in answer
try this code,
if (preg_match('/(\.jpg|\.png|\.bmp)$/i', $aaa)) {
echo "image";
} else{
echo "not image";
}
Maybe you are looking for this:
function isImageFile($file) {
$info = pathinfo($file);
return in_array(strtolower($info['extension']),
array("jpg", "jpeg", "gif", "png", "bmp"));
}
pathinfo to retrieve detail information about file including extension.strtolower to ensure that the extension will match our list of supported image even it is in different casein_array to check whether file extension is in our list of image extenion.try this
$allowed = array(
'.jpg',
'.jpeg',
'.gif',
'.png',
'.flv'
);
if (!in_array(strtolower(strrchr($inage_name, '.')), $allowed)) {
print_r('error message');
}else {
echo "correct image";
}
or strrchr it takes last occurence of character string.. else some other concept.
$allowed = array(
'image/jpeg',
'image/pjpeg',
'image/png',
'image/x-png',
'image/gif',
'application/x-shockwave-flash'
);
if (!in_array($image_name, $allowed)) {
print_r('error message');
}else {
echo "correct image";
}
Here you can used STRTOLOWER function and also used in_array function
try this:
$a=pathinfo("example.exe");
var_dump($a['extension']);//returns exe
Yes, regex is the way to go. Alternatively, you could split around the "." and check the last element in the returned array against an array of image extensions. I'm not a PHP guy so I can't write the code for you, but I can write the regex:
^[a-zA-Z\.0-9_-]+\.([iI][mM][gG]|[pP][nN][gG]|etc....)$
This one is fairly simple. I know you don't have much experience with regex, but here's what this one does:
^: start of string
[a-zA-Z\.0-9_-]: describes range of characters including all letters, numbers, and ._-
\.: "." character
([iI][mM][gG]|[pP][nN][gG]|etc....): | means or. So just put all image extensions you know here. Again, the brackets for case-insensitivity
if you want to match any sequence then instead of the stuff in the brackets and the +, just use:
.*
"." matches any character and "*" means any amount of it. So this just basically says "no restrictions" (except newlines)
There are probably a lot of other things I'm missing, as you can see in the comments. Just read those, look at a regex reference, and you'll be fine.
"." and check the last element"
[a-zA-Z\.0-9_-]...pathinfo() is better and much easier.Try this
use pathinfo():
$ext = pathinfo($file_name, PATHINFO_EXTENSION); case sensitive
if (in_array($ext, $supported_image)) {
echo "it's image";
} else {
echo 'not image';
}
