It should be something like:
$WAFV_Errors .= WAValidateNM($WA_DFP_UploadStatus["WA_UploadResult1"]["WA_UploadResult1_1"]["imageWidth"] . "",299,301,"",",.",true,1);
$WAFV_Errors .= WAValidateNM($WA_DFP_UploadStatus["WA_UploadResult1"]["WA_UploadResult1_1"]["imageHeight"] . "",199,201,"",",.",true,3);