Math Functions
PHP Manual

max

Find highest value

Description

mixed max ( array $values )
mixed max ( mixed $value1 , mixed $value2 [, mixed $... ] )

If the first and only parameter is an array, max returns the highest value in that array. If at least two parameters are provided, max returns the biggest of these values.

Note:

PHP will evaluate a non-numeric string as 0 if compared to integer, but still return the string if it's seen as the numerically highest value. If multiple arguments evaluate to 0, max will return a numeric 0 if given, else the alphabetical highest string value will be returned.

Parameters

values

An array containing the values.

value1

Any comparable value.

value2

Any comparable value.

...

Any comparable value.

Return Values

max returns the numerically highest of the parameter values. If multiple values can be considered of the same size, the one that is listed first will be returned.

When max is given multiple arrays, the longest array is returned. If all the arrays have the same length, max will use lexicographic ordering to find the return value.

When given a string it will be cast as an integer when comparing.

Examples

Example #1 Example uses of max

<?php
echo max(1, 3, 5, 6, 7);  // 7
echo max(array(2, 4, 5)); // 5

// When 'hello' is cast as integer it will be 0. Both the parameters are equally
// long, so the order they are given in determines the result
echo max(0, 'hello');     // 0
echo max('hello', 0);     // hello

echo max('42', 3); // '42'

// Here 0 > -1, so 'hello' is the return value.
echo max(-1, 'hello');    // hello

// With multiple arrays of different lengths, max returns the longest
$val = max(array(2, 2, 2), array(1, 1, 1, 1)); // array(1, 1, 1, 1)

// With multiple arrays of the same length, max compares from left to right
// using lexicographic order, so in our example: 2 == 2, but 4 < 5
$val = max(array(2, 4, 8), array(2, 5, 7)); // array(2, 5, 7)

// If both an array and non-array are given, the array
// is always returned as it's seen as the largest
$val = max('string', array(2, 5, 7), 42);   // array(2, 5, 7)
?>

See Also

  • min
  • count