{"id":1407,"date":"2019-06-27T09:26:42","date_gmt":"2019-06-27T19:26:42","guid":{"rendered":"https:\/\/mymonkeydo.com\/?p=1407"},"modified":"2019-06-27T09:26:42","modified_gmt":"2019-06-27T19:26:42","slug":"php-anything-in_array-0-is-true","status":"publish","type":"post","link":"https:\/\/mymonkeydo.com\/php-anything-in_array-0-is-true\/","title":{"rendered":"PHP &#8211; &#8216;anything&#8217; in_array 0 is true"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>$orderby = 'something';\n$column_names = array( 0, 1, 2, 3, 'acolumn' );\nif ( in_array( $orderby, $column_names ) ) {\n    $orderby = 'got here';\n}\nelse {\n    $orderby = '';\n}\n\n\/\/ shows 'got here'\necho $orderby;<\/code><\/pre>\n\n\n\n<p>To my surprise an any array with value of 0 will cause the in_array function to be true.  This is because PHP converts the string being compared to a number.  &#8216;something&#8217; == 0 is true because &#8216;something&#8217; gets converted to 0 as a number.<\/p>\n\n\n\n<p>The same case is true for the opposite case, which is asked and answered on <a href=\"https:\/\/stackoverflow.com\/questions\/13846769\/php-in-array-0-value\">stack overflow<\/a> (you&#8217;ll find a more detailed explanation there).<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$orderby = 0;\n$column_names = array( 1, 2, 3, 'acolumn' );\nif ( in_array( $orderby, $column_names ) ) {\n    $orderby = 'got here';\n}\nelse {\n    $orderby = '';\n}\n\n\/\/ shows 'got here'\necho $orderby;<\/code><\/pre>\n\n\n\n<p>The solution is really to almost always set the <a href=\"https:\/\/www.php.net\/manual\/en\/function.in-array.php\">third parameter<\/a> to TRUE.  This puts in_array into strict mode which compares the type of the needle.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$orderby = 'something';\n$column_names = array( 0, 1, 2, 3, 'acolumn' );\nif ( in_array( $orderby, $column_names, true ) ) {\n    $orderby = 'will not get here';\n}\nelse {\n    $orderby = '';\n}\n\n\/\/ shows ''\necho $orderby;<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[2],"tags":[54],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>PHP - &#039;anything&#039; in_array 0 is true - My Monkey Do<\/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:\/\/mymonkeydo.com\/php-anything-in_array-0-is-true\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PHP - &#039;anything&#039; 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