Php get array key by index
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To get the numeric index of an associative array, the code is as follows− Show ExampleLive Demo "5", "b"=>"20", "c"=>"35", "d"=>"55");
$keys = array_keys( $arr );
echo "Array key and value...\n";
for($x = 0; $x < sizeof($arr); $x++ ) {
echo "key: ". $keys[$x] . ", value: ". $arr[$keys[$x]] . "\n";
}
?>OutputThis will produce the following output− Array key and value... key: a, value: 5 key: b, value: 20 key: c, value: 35 key: d, value: 55 ExampleLet us now see another example− Live Demo "150", "q"=>"100", "r"=>"120", "s"=>"110");
$keys = array_keys( $arr );
echo "Array key and value...\n";
for($x = 0; $x < sizeof($arr); $x++ ) {
echo "key: ". $keys[$x] . ", value: ". $arr[$keys[$x]] . "\n";
}
$arr[$keys[3]] = "25";
echo "\nUpdated Array key and value...\n";
for($x = 0; $x < sizeof($arr); $x++ ) {
echo "key: ". $keys[$x] . ", value: ". $arr[$keys[$x]] . "\n";
}
?>OutputThis will produce the following output− Array key and value... key: p, value: 150 key: q, value: 100 key: r, value: 120 key: s, value: 110 Updated Array key and value... key: p, value: 150 key: q, value: 100 key: r, value: 120 key: s, value: 25
 Updated on 27-Dec-2019 07:39:23
❮ PHP Array Reference ExampleReturn an array containing the keys: $a=array("Volvo"=>"XC90","BMW"=>"X5","Toyota"=>"Highlander"); Try it Yourself » Definition and UsageThe array_keys() function returns an array containing the keys. Syntaxarray_keys(array, value, strict) Parameter Values
Technical Details
More ExamplesExampleUsing the value parameter: $a=array("Volvo"=>"XC90","BMW"=>"X5","Toyota"=>"Highlander"); Try it Yourself » ExampleUsing the strict parameter, false: $a=array(10,20,30,"10"); Try it Yourself » ExampleUsing the strict parameter, true: $a=array(10,20,30,"10"); Try it Yourself » ❮ PHP Array Reference View Discussion Improve Article Save Article View Discussion Improve Article Save Article In PHP we can associate name/label with each array elements using => symbol. This is very helpful as it is easy to remember the element because
each element is represented by the label rather than the index value. Syntax: array array_keys( $input_array, $search_value, $strict ) Program 1: Program to get numeric index of associative array using array_keys() function.
Example 2: Below program uses index to access the values in associative array.
How do you find array keys?The array_keys() function is used to get all the keys or a subset of the keys of an array. Note: If the optional search_key_value is specified, then only the keys for that value are returned. Otherwise, all the keys from the array are returned. Specified array.
How do you print the key in an associative array?Answer: Use the PHP array_keys() function
You can use the PHP array_keys() function to get all the keys out of an associative array.
How get key of multidimensional array in PHP?Retrieving Values: We can retrieve the value of multidimensional array using the following method:. Using key: We can use key of the associative array to directly retrieve the data value. ... . Using foreach loop: We can use foreach loop to retrieve value of each key associated inside the multidimensional associative array.. What is $Key in PHP?The key() function simply returns the key of the array element that's currently being pointed to by the internal pointer. It does not move the pointer in any way. If the internal pointer points beyond the end of the elements list or the array is empty, key() returns null .
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