We have given an array arr and a Key key, the task is to check if a key exists in an array or not in PHP.<\/p>\n\n\n\n
Examples:<\/p>\n\n\n\n
Input : arr = [“Devop1”, “Devop2”, “1”, “2”,”3″]
key = “2”
Output: Found the Key<\/p>\n\n\n\n
Input : arr = [“Devop1”, “Devop2”, “1”, “2”,”3″]
key = 9
Output: Key not Found<\/p>\n\n\n\n
The problem can be solved using PHP inbuilt function for checking key exists in a given array. The in-built function used for the given problem are:<\/p>\n\n\n\n
Method 1: Using array_key_exists() Method:<\/strong> The array_key_exists() function checks whether a specific key or index is present inside an array or not.<\/p>\n\n\n\n Syntax:<\/p>\n\n\n\n boolean array_key_exists( $index, $array ) Output Syntax:<\/p>\n\n\n\n bool isset( mixed $var, mixed $\u2026 )<\/p>\n\n\n\n Output <\/p>\n","protected":false},"excerpt":{"rendered":" We have given an array arr and a Key key, the task is to check if a key exists in an array or not in PHP. Examples:… <\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[145,165,113],"tags":[173,175,176,174],"class_list":["post-425","post","type-post","status-publish","format-standard","hentry","category-array","category-function","category-php","tag-array_key_exists-method","tag-check-a-key-exist-in-an-array","tag-php-inbuilt-function","tag-using-isset-method"],"yoast_head":"\n
Example:<\/p>\n\n\n\n<?php\r\n\/\/ PHP program to check if a key \r\n\/\/ exists in an array or not\r\n \r\n$array = array(\r\n 'names' => array(\"Devop1\", \"Devop2\", \"Devop3\"), \r\n 'rank' => array('1', '2', '3')\r\n); \r\n \r\n\/\/ Use of array_key_exists() function\r\nif(array_key_exists(\"rank\", $array)) {\r\n echo \"Found the Key\"; \r\n} \r\nelse{ \r\n echo \"Key not Found\"; \r\n} \r\n \r\n?><\/code><\/pre>\n\n\n\n
Found the Key
Method 2: Using isset() Method:<\/strong> The isset() function checks whether a specific key or index is present inside an array or not.<\/p>\n\n\n\n<?php\r\n\/\/ PHP program to check if a key \r\n\/\/ exists in an array or not\r\n \r\n$array = array(\r\n 'names' => array(\"Devop1\", \"Devop2\", \"Devop3\"), \r\n 'rank' => array('1', '2', '3')\r\n); \r\n \r\n\/\/ Use of array_key_exists() function\r\nif(isset($array[\"rank\"])){\r\n echo \"Found the Key\"; \r\n} \r\nelse{ \r\n echo \"Key not Found\"; \r\n} \r\n \r\n?><\/code><\/pre>\n\n\n\n
Found the Key<\/p>\n\n\n\n