array_key_exists : Associate Array « Data Structure « PHP

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array_key_exists

<?php
   $state["Delaware"] = "December 7, 1787";
   $state["Pennsylvania"] = "December 12, 1787";
   $state["Ohio"] = "March 1, 1803";
   if (array_key_exists("Ohio", $state)) echo "Ohio joined the Union on $state[Ohio]";
?>

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6.Reference the assiciate array element
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8.Associative Arrays
9.Looping Through an Associative Array with foreach
10.key: Fetch a key from an associative array
11.print_r: output associate array
12.array_intersect_assoc: Computes the intersection of arrays with additional index check
13.An array called $computers with numeric and string keys
14.An array called $vegetables with string keys
15.Argument Swapping
16.Array to object
17.Assigning and Comparing
18.Building an array of defaults
19.Creates an array with keys 'a', 'b' and 'c with values of 1, 2 and 3 as well as keys 0, 1 and 2 with values 'a', 'b', and 'c'
20.Creating Arrays
21.Creates an array that assigns keys 1 through 7 to the days of the week.
22.Creating a multidimensional array
23.Creating an associative array of shapes
24.Obtaining Array Keys and Values
25.Obtaining Array Keys with a Given Value
26.One-based array index
27.Displaying one value from an array
28.Using both the array key and a passed-in value to modify each element value
29.Using Variable Variables to Create Associations