In PHP, the in_array() function is a built-in function that is used to check if a value exists in an array. The function takes two mandatory arguments: the value to search for and the array in which to search for it.<\/p>\n
For example, the following code checks if the value “apple” exists in the array $fruits:<\/p>\n
\r\n\r\n$fruits = array("banana", "orange", "apple", "strawberry");\r\nif (in_array("apple", $fruits)) {\r\necho "The value exists in the array.";\r\n} else {\r\necho "The value does not exist in the array.";\r\n}\r\n\r\n<\/pre>\nThe above code will output “The value exists in the array.”<\/p>\n
It also accept an optional third argument, $strict<\/strong>, which when set to true, the function will also check the types of the values. So if you are looking for a value that is 0 in an array that contains “0” as well, using strict check will return false while non-strict check will return true.<\/p>\n\r\n\r\n$arr = array(0, "0");\r\nif (in_array("0", $arr, true)) {\r\necho "found 0 as a string";\r\n}\r\nelseif (in_array(0, $arr, true)) {\r\necho "found 0 as an integer";\r\n}\r\n\r\n<\/pre>\nThis will output “found 0 as an integer”.<\/p>\n
It is important to note that if the third argument, $strict, is not passed to the function, it defaults to false. This means that the function will perform a loose comparison (==) instead of a strict comparison (===). This can lead to unexpected results, especially when searching for values of different types. For example, the following code will return true when the $strict parameter is not passed, because “0” is loosely equal to 0:<\/p>\n
\r\n\r\n$arr = array("1", "2", "3", "0");\r\nif (in_array(0, $arr)) {\r\necho "0 is in the array";\r\n}\r\n\r\n<\/pre>\nThis will output “0 is in the array”.<\/p>\n
However, this can cause problems in certain situations and it’s recommended to always pass true as the third argument to ensure that the function performs a strict comparison and returns the expected results.<\/p>\n
In summary, in_array() function is a useful function in PHP to check if a value exists in an array. But it’s dangerous if not passing the $strict parameter to avoid the unexpected results and it’s recommended to always use the $strict parameter for the better results.<\/p>\n","protected":false},"excerpt":{"rendered":"
In PHP, the in_array() function is a built-in function that is used to check if a value exists in an array. The function takes two mandatory arguments: the value to search for and the array in which to search for it. For example, the following code checks if the value “apple” exists in the array<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_dcms_eufi_img":"","footnotes":"","_links_to":"","_links_to_target":""},"categories":[963,964,974,952,989,991,1001],"tags":[],"class_list":["post-12302","post","type-post","status-publish","format-standard","hentry","category-articles-2","category-cakephp-2-development-tools","category-development-tools","category-highlights-2","category-php-2","category-programming","category-wordpress"],"yoast_head":"\n
Avoiding issues with PHP in_array by using $strict parameter - Techmoz<\/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:\/\/techmoz.net\/en\/avoiding-issues-with-php-in_array-by-using-strict-parameter\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Avoiding issues with PHP in_array by using $strict parameter - Techmoz\" \/>\n<meta property=\"og:description\" content=\"In PHP, the in_array() function is a built-in function that is used to check if a value exists in an array. The function takes two mandatory arguments: the value to search for and the array in which to search for it. 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