[PHP] Eregi for Image

[Jeff Oien]

I want to check if an uploaded file is an image. This isn't working. 
Could anyone  help me out?

if (!eregi("\\.gif$", $img1_name) || 
!eregi("\\.jpg$", $img1_name) || 
!eregi("\\.jpeg$", $img1_name)) {
        error message
}

Jeff Oien

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