fix of #509, related to php 5.3
fix of #509, related to php 5.3

antoniosejas/wallabag,shtrom/wallabag,pmichelazzo/wallabag,aarizkuren/wallabag,wallabag/wallabag,harikt/wallabag,FabienM/wallabag,kevmeyer/wallabag,egilli/wallabag,harikt/wallabag,freddyb/wallabag,wangjun/wallabag,modos189/wallabag,wallabag/wallabag,FabienM/wallabag,X-dark/wallabag,mubassirhayat/wallabag,X-dark/wallabag,shtrom/wallabag,mubassirhayat/wallabag,FabienM/wallabag,kevmeyer/wallabag,freddyb/wallabag,aarizkuren/wallabag,freddyb/wallabag,kwangkim/wallabag,X-dark/wallabag,egilli/wallabag,kwangkim/wallabag,antoniosejas/wallabag,egilli/wallabag,antoniosejas/wallabag,ekospinach/wallabag,shtrom/wallabag,pmichelazzo/wallabag,kevmeyer/wallabag,modos189/wallabag,kevmeyer/wallabag,mubassirhayat/wallabag,aarizkuren/wallabag,aarizkuren/wallabag,milanaleksic/wallabag,X-dark/wallabag,pmichelazzo/wallabag,kwangkim/wallabag,pmichelazzo/wallabag,shtrom/wallabag,pmichelazzo/wallabag,harikt/wallabag,shtrom/wallabag,X-dark/wallabag,wangjun/wallabag,ekospinach/wallabag,milanaleksic/wallabag,wangjun/wallabag,modos189/wallabag,milanaleksic/wallabag,ekospinach/wallabag,egilli/wallabag,egilli/wallabag,wallabag/wallabag,FabienM/wallabag