Memory Limit Exhausted Regardless of Allowance

PHP
1

I have set the “memory_limit” in the php.ini file to 25M, and have a file that gives me this error:

Fatal error:  Allowed memory size of 26214400 bytes exhausted (tried to allocate 19218544 bytes) in /link/to/directory/file.php on line 142

Note that the memory size is actually BIGGER than what it tried to allocate. I don’t know how that’s possible. This is line 142 to which it refers:

list($width, $height) = getimagesize("files/".$file_num.".swf");

I did a memory_get_usage() before line 142, and it was 138356 so it isn’t anything else that’s eating up some memory. Not sure what my next step is to fix this. Thoughts?

2

How large is the file? Perhaps PHP is trying to open the file and running out of memory.

3

The file is about 8MB.

What I’m most confused about is how the amount of memory it tries to allocate is LESS than how much capacity it actually has.

4

You’re using getimagesize on a .swf ?

5

Yes I am. The specific code is in the first post.

6

The documentation states the function get the size of an image, an .swf is not an image. Are you sure this functionality exists?

7

Yep, I’ve used the function for that purpose many times in the past. Current problem is just because I’m on a new server.

8

getimagesize can read the dimensions of a SWF file as long as the canvas isn’t empty.

What happens if you increase the memory_limit even more?

I don’t think it’s wise to rely on memory_get_usage() in this manner as the compiled bytecode may have many more steps between your last memory_get_usage() and when it actually tries to read the dimensions of the file. Perhaps it loads the entire file into memory (+/- 8Mb) and then unzips it and tries to read the canvas (even more memory).

9

An increase in memory does actually solve the problem. I have it up to 30M right now. It doesn’t seem there’s an easier way to get the dimensions of a swf, so I guess memory increases will have to do. I just found it curious that the error message PHP gave wasn’t really accurate.

Thanks for everyone’s help!

10

I love this stuff, I’m always learning!

The source code confirms this too, cheers Immerse. :cool:


static void php_getimagesize_from_stream(php_stream *stream, zval **info, INTERNAL_FUNCTION_PARAMETERS) /* {{{ */
{
    char *temp;
    int itype = 0;
    struct gfxinfo *result = NULL;

    if (!stream) {
        RETURN_FALSE;
    }

    itype = php_getimagetype(stream, NULL TSRMLS_CC);
    switch( itype) {
        case IMAGE_FILETYPE_GIF:
            result = php_handle_gif(stream TSRMLS_CC);
            break;
        case IMAGE_FILETYPE_JPEG:
            if (info) {
                result = php_handle_jpeg(stream, *info TSRMLS_CC);
            } else {
                result = php_handle_jpeg(stream, NULL TSRMLS_CC);
            }
            break;
        case IMAGE_FILETYPE_PNG:
            result = php_handle_png(stream TSRMLS_CC);
            break;
        case IMAGE_FILETYPE_SWF:
            result = php_handle_swf(stream TSRMLS_CC);
            break;
        case IMAGE_FILETYPE_SWC:
#if HAVE_ZLIB && !defined(COMPILE_DL_ZLIB)
            result = php_handle_swc(stream TSRMLS_CC);
#else
            php_error_docref(NULL TSRMLS_CC, E_NOTICE, "The image is a compressed SWF file, but you do not have a static version of the zlib extension enabled");
#endif
            break;
        case IMAGE_FILETYPE_PSD:
            result = php_handle_psd(stream TSRMLS_CC);
            break;
        case IMAGE_FILETYPE_BMP:
            result = php_handle_bmp(stream TSRMLS_CC);
            break;
        case IMAGE_FILETYPE_TIFF_II:
            result = php_handle_tiff(stream, NULL, 0 TSRMLS_CC);
            break;
        case IMAGE_FILETYPE_TIFF_MM:
            result = php_handle_tiff(stream, NULL, 1 TSRMLS_CC);
            break;
        case IMAGE_FILETYPE_JPC:
            result = php_handle_jpc(stream TSRMLS_CC);
            break;
        case IMAGE_FILETYPE_JP2:
            result = php_handle_jp2(stream TSRMLS_CC);
            break;
        case IMAGE_FILETYPE_IFF:
            result = php_handle_iff(stream TSRMLS_CC);
            break;
        case IMAGE_FILETYPE_WBMP:
            result = php_handle_wbmp(stream TSRMLS_CC);
            break;
        case IMAGE_FILETYPE_XBM:
            result = php_handle_xbm(stream TSRMLS_CC);
            break;
        case IMAGE_FILETYPE_ICO:
            result = php_handle_ico(stream TSRMLS_CC);
            break;
        default:
        case IMAGE_FILETYPE_UNKNOWN:
            break;
    }

    if (result) {
        array_init(return_value);
        add_index_long(return_value, 0, result->width);
        add_index_long(return_value, 1, result->height);
        add_index_long(return_value, 2, itype);
        spprintf(&temp, 0, "width=\\"%d\\" height=\\"%d\\"", result->width, result->height);
        add_index_string(return_value, 3, temp, 0);

        if (result->bits != 0) {
            add_assoc_long(return_value, "bits", result->bits);
        }
        if (result->channels != 0) {
            add_assoc_long(return_value, "channels", result->channels);
        }
        add_assoc_string(return_value, "mime", (char*)php_image_type_to_mime_type(itype), 1);
        efree(result);
    } else {
        RETURN_FALSE;
    }
}
/* }}} */