{"id":384,"date":"2018-07-20T18:09:14","date_gmt":"2018-07-20T16:09:14","guid":{"rendered":"https:\/\/numa-bord.com\/miniblog\/?p=384"},"modified":"2018-07-20T18:13:11","modified_gmt":"2018-07-20T16:13:11","slug":"php-classer-un-tableau-dobjets-avec-usort","status":"publish","type":"post","link":"https:\/\/numa-bord.com\/miniblog\/php-classer-un-tableau-dobjets-avec-usort\/","title":{"rendered":"PHP : classer un tableau d\u2019objets avec usort"},"content":{"rendered":"

En PHP il arrive de se retrouver avec un tableau d\u2019objets qui n’est pas ordonn\u00e9 comme on le voudrait, il faut dans ce cas utiliser la fonction usort<\/a> qui permet de trier un tableau en utilisant une fonction de comparaison.<\/p>\n

Imaginons nous avons un tableau \u00ab\u00a0$list\u00a0\u00bb d’objets \u00ab\u00a0User\u00a0\u00bb, contenant -entre autre- les propri\u00e9t\u00e9s \u00ab\u00a0Date\u00a0\u00bb et \u00ab\u00a0Name\u00a0\u00bb, Date \u00e9tant un objet DateTime et Name un string<\/p>\n

Pour trier par date il faut cr\u00e9er et appeler la fonction suivante (l’exemple peux s’appliquer \u00e0 n’importe quel tri)<\/p>\n

\/\/on d\u00e9clare la fonction de tri<\/span>
\norderByDate(<\/span>$a<\/span>,<\/span> $b<\/span>)<\/span> {<\/span>
\n    \/\/retourner 0 en cas d'\u00e9galit\u00e9<\/span>
\n    if<\/span> (<\/span>$a<\/span>-><\/span>date<\/span><\/a> ==<\/span> $b<\/span>-><\/span>date<\/span><\/a>)<\/span> {<\/span>
\n        return<\/span> 0<\/span>;<\/span>
\n    }<\/span> else<\/span> if<\/span> (<\/span>$a<\/span>-><\/span>date<\/span><\/a> <<\/span> $b<\/span>-><\/span>date<\/span><\/a>)<\/span> {<\/span>\/\/retourner -1 en cas d\u2019inf\u00e9riorit\u00e9<\/span>
\n        return<\/span> -<\/span>1<\/span>;<\/span>
\n    }<\/span> else<\/span> {<\/span>\/\/retourner 1 en cas de sup\u00e9riorit\u00e9 <\/span>
\n        return<\/span> 1<\/span>;<\/span>
\n    }<\/span>
\n}<\/span>
\n\/\/appel de la fonction avec notre tableau $list, $list contiendra ensuite les "User" tri\u00e9 par date.<\/span>
\nusort<\/span><\/a>(<\/span>$list<\/span>,<\/span> "orderByDate"<\/span>)<\/span>;<\/span><\/div><\/div>\n

Si votre fonction est dans une classe et que vous l’utilisez depuis cette m\u00eame classe, il faut l’appeler comme ceci : <\/p>\n

usort<\/span><\/a>(<\/span>$list<\/span>,<\/span> array<\/span><\/a>(<\/span>$this<\/span>,<\/span> "orderByDate"<\/span>)<\/span>)<\/span>;<\/span><\/div><\/div>\n

Dans le cas d’une comparaison de chaine (comme par exemple ici sur le nom) on peux simplifier la syntaxe en utilisant la fonction strcmp<\/a> de la mani\u00e8re suivante : <\/p>\n

\/\/on d\u00e9clare la fonction<\/span>
\norderByName(<\/span>$a<\/span>,<\/span> $b<\/span>)<\/span> {<\/span>
\n    return<\/span> strcmp<\/span><\/a>(<\/span>$a<\/span>-><\/span>name<\/span>,<\/span> $b<\/span>-><\/span>name<\/span>)<\/span>;<\/span>
\n}<\/span>
\n\/\/appel de la fonction<\/span>
\nusort<\/span><\/a>(<\/span>$list<\/span>,<\/span> "orderByName"<\/span>)<\/span>;<\/span><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"

En PHP il arrive de se retrouver avec un tableau d\u2019objets qui n’est pas ordonn\u00e9 comme on le voudrait, il faut dans ce cas utiliser la fonction usort qui permet de trier un tableau en utilisant une fonction de comparaison. Imaginons nous avons un tableau \u00ab\u00a0$list\u00a0\u00bb d’objets \u00ab\u00a0User\u00a0\u00bb, contenant -entre autre- les propri\u00e9t\u00e9s \u00ab\u00a0Date\u00a0\u00bb et […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2,7],"tags":[],"class_list":["post-384","post","type-post","status-publish","format-standard","hentry","category-developpement","category-php"],"acf":[],"yoast_head":"\nPHP : classer un tableau d\u2019objets avec usort - Pense b\u00eate d'un d\u00e9veloppeur web<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/numa-bord.com\/miniblog\/php-classer-un-tableau-dobjets-avec-usort\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PHP : classer un tableau d\u2019objets avec usort - Pense b\u00eate d'un d\u00e9veloppeur web\" \/>\n<meta property=\"og:description\" content=\"En PHP il arrive de se retrouver avec un tableau d\u2019objets qui n’est pas ordonn\u00e9 comme on le voudrait, il faut dans ce cas utiliser la fonction usort qui permet de trier un tableau en utilisant une fonction de comparaison. 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