Search Inside Array (Array From Imagemagick identify verbose)

Hi, I use identify of image magick for get some informations of one image, like you see in code box.....
The result is:
=========================================
Array
(
    [0] => Image: 5photos.jpg
    [1] =>   Format: JPEG (Joint Photographic Experts Group JFIF format)
    [2] =>   Class: DirectClass
    [3] =>   Geometry: 473x335+0+0
    [4] =>   Resolution: 100x100
    [5] =>   Print size: 4.73x3.35
    [6] =>   Units: PixelsPerInch
    [7] =>   Type: TrueColor
    [8] =>   Endianess: Undefined
    [9] =>   Colorspace: RGB
    [10] =>   Depth: 8-bit
    [11] =>   Channel depth:
    [12] =>     red: 8-bit
    [13] =>     green: 8-bit
    [14] =>     blue: 8-bit
    [15] =>   Channel statistics:
    [16] =>     red:
    [17] =>       min: 0 (0)
    [18] =>       max: 255 (1)
    [19] =>       mean: 117.824 (0.462055)
    [20] =>       standard deviation: 60.0605 (0.235531)
    [21] =>     green:
    [22] =>       min: 0 (0)
    [23] =>       max: 255 (1)
    [24] =>       mean: 120.322 (0.471852)
    [25] =>       standard deviation: 60.9865 (0.239163)
    [26] =>     blue:
    [27] =>       min: 0 (0)
    [28] =>       max: 255 (1)
    [29] =>       mean: 80.0232 (0.313817)
    [30] =>       standard deviation: 69.9419 (0.274282)
    [31] =>   Rendering intent: Undefined
    [32] =>   Interlace: None
    [33] =>   Background color: white
    [34] =>   Border color: rgb(223,223,223)
    [35] =>   Matte color: grey74
    [36] =>   Transparent color: black
    [37] =>   Page geometry: 473x335+0+0
    [38] =>   Dispose: Undefined
    [39] =>   Iterations: 0
    [40] =>   Compression: JPEG
    [41] =>   Quality: 38
    [42] =>   Orientation: Undefined
    [43] =>   Properties:
    [44] =>     comment: LEAD Technologies Inc. V1.01
    [45] =>     create-date: 2009-01-25T00:26:29+00:00
    [46] =>     jpeg:colorspace: 2
    [47] =>     jpeg:sampling-factor: 1x1,1x1,1x1
    [48] =>     modify-date: 2009-01-25T00:26:29+00:00
    [49] =>     signature: 204ae33f228d443047c10924a09de9298c4138b8f0b4eb4bfedf18846ca20276
    [50] =>   Artifacts:
    [51] =>     verbose: true
    [52] =>   Tainted: False
    [53] =>   Filesize: 22.209kb
    [54] =>   Number pixels: 154.74kb
    [55] =>   Version: ImageMagick 6.4.1 06/02/08 Q16 OpenMP http://www.imagemagick.org
)
==============================================
I want identify the 'quality' of each image, but the results not is allways the same, in this case quality appear in [41], and other images appear in [393] and so on.
So, if I cant identify the quality of each photo, I cant do a dinamic script.

For this problem, I thing is possible with search inside the array.
I want search where is the position of 'quality' of each image.

The best regars,
JC

exec("/usr/bin/identify -verbose 5photos.jpg", $varrr);
echo '<pre>';
print_r($varrr);
echo '</pre>';

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