{"id":266,"date":"2013-04-15T15:25:19","date_gmt":"2013-04-15T13:25:19","guid":{"rendered":"http:\/\/www.lafabriquedecode.com\/blog\/?p=266"},"modified":"2013-04-15T15:31:00","modified_gmt":"2013-04-15T13:31:00","slug":"php-objet-le-late-static-binding-en-5-minutes-chrono","status":"publish","type":"post","link":"http:\/\/www.lafabriquedecode.com\/blog\/2013\/04\/php-objet-le-late-static-binding-en-5-minutes-chrono\/","title":{"rendered":"PHP objet : le late static binding en 5 minutes chrono"},"content":{"rendered":"<p><a href=\"http:\/\/www.lafabriquedecode.com\/blog\/wp-content\/uploads\/2013\/04\/913_always_late_car_decal__04163.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-275\" alt=\"913_always_late_car_decal__04163\" src=\"http:\/\/www.lafabriquedecode.com\/blog\/wp-content\/uploads\/2013\/04\/913_always_late_car_decal__04163.png\" width=\"438\" height=\"438\" srcset=\"http:\/\/www.lafabriquedecode.com\/blog\/wp-content\/uploads\/2013\/04\/913_always_late_car_decal__04163.png 438w, http:\/\/www.lafabriquedecode.com\/blog\/wp-content\/uploads\/2013\/04\/913_always_late_car_decal__04163-150x150.png 150w, http:\/\/www.lafabriquedecode.com\/blog\/wp-content\/uploads\/2013\/04\/913_always_late_car_decal__04163-300x300.png 300w\" sizes=\"(max-width: 438px) 100vw, 438px\" \/><\/a><\/p>\n<p>Top, c&rsquo;est parti ! Tout d&rsquo;abord, qu&rsquo;est-ce que le <em>late static binding<\/em> (r\u00e9solution statique \u00e0 la vol\u00e9e), me direz-vous ? C&rsquo;est un m\u00e9canisme qui, dans un contexte d&rsquo;appel statique, permet de faire r\u00e9f\u00e9rence \u00e0 la classe courante (la \u00ab\u00a0vraie\u00a0\u00bb classe). Voici comment nous faisions (avant PHP 5.3) dans un contexte d&rsquo;<em>h\u00e9ritage statique<\/em> (A a une m\u00e9thode statique dont B h\u00e9rite tout en l&rsquo;\u00e9crasant &#8211; m\u00eame si elle est identique \u00e0 l&rsquo;originale) :<\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">\r\n\r\nclass A {\r\n    public function pointDentree() {\r\n        self::methode();\r\n    }\r\n\r\n    public static function methode() {\r\n        echo __CLASS__, PHP_EOL;\r\n    }\r\n}\r\n\r\nclass B extends A {\r\n    public static function methode() {\r\n        echo __CLASS__, PHP_EOL;\r\n    }\r\n}\r\n\r\n$b = new B;\r\n$b-&gt;pointDentree();\r\n\r\n<\/pre>\n<p>Nous instancions un objet de la classe B, nous nous attendons donc \u00e0 avoir \u00ab\u00a0B\u00a0\u00bb affich\u00e9 \u00e0 l&rsquo;\u00e9cran or c&rsquo;est A qui s&rsquo;affiche, signe que la r\u00e9solution statique ne se fait pas au <em>runtime<\/em> (ex\u00e9cution) mais \u00e0 la d\u00e9finition de la classe (compilation). Pour obtenir le comportement attendu, il suffit de faire usage du mot cl\u00e9 <em>static<\/em> :<\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">\r\n\r\nclass A {\r\n    public function pointDentree() {\r\n        static::methode();\r\n    }\r\n\r\n    public static function methode() {\r\n        echo __CLASS__, PHP_EOL;\r\n    }\r\n}\r\n\r\nclass B extends A {\r\n    public static function methode() {\r\n        echo __CLASS__, PHP_EOL;\r\n    }\r\n}\r\n\r\n$b = new B;\r\n$b-&gt;pointDentree();\r\n\r\n<\/pre>\n<p>Ici j&rsquo;ai bien B qui s&rsquo;affiche !\u00a0PHP nous donne les raisons de la limitation du mot cl\u00e9 self :<\/p>\n<blockquote><p><strong>Les r\u00e9f\u00e9rences statiques \u00e0 la classe courante, avec self:: ou __CLASS__, sont r\u00e9solues en utilisant la classe \u00e0 laquelle appartiennent les fonctions, celle o\u00f9 elles ont \u00e9t\u00e9 d\u00e9finies\u00a0<\/strong>(source : <a href=\"http:\/\/php.net\/manual\/fr\/language.oop5.late-static-bindings.php\">http:\/\/php.net\/manual\/fr\/language.oop5.late-static-bindings.php<\/a>)<\/p><\/blockquote>\n<p>Utilisez donc \u00e0 bon escient ce m\u00e9canisme de<em> late static binding<\/em> dans vos d\u00e9veloppements, un effet de bord est si vite arriv\u00e9 quand on fait de l&rsquo;h\u00e9ritage statique !<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Top, c&rsquo;est parti ! Tout d&rsquo;abord, qu&rsquo;est-ce que le late static binding (r\u00e9solution statique \u00e0 la vol\u00e9e), me direz-vous ? C&rsquo;est un m\u00e9canisme qui, dans un contexte d&rsquo;appel statique, permet de faire r\u00e9f\u00e9rence \u00e0 la classe courante (la \u00ab\u00a0vraie\u00a0\u00bb classe). Voici comment nous faisions (avant PHP 5.3) dans un contexte d&rsquo;h\u00e9ritage statique (A a une [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[3],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.6.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>PHP objet : le late static binding en 5 minutes chrono - La Fabrique de code - Tech blog<\/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:\/\/www.lafabriquedecode.com\/blog\/2013\/04\/php-objet-le-late-static-binding-en-5-minutes-chrono\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PHP objet : le late static binding en 5 minutes chrono - La Fabrique de code - Tech blog\" \/>\n<meta property=\"og:description\" content=\"Top, c&rsquo;est parti ! 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