(PHP 4, PHP 5, PHP 7, PHP 8)
max — Find highest value
Alternative signature (not supported with named arguments):
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:
Values of different types will be compared using the standard comparison rules. For instance, a non-numeric string will be compared to an int as though it were
0, but multiple non-numeric string values will be compared alphanumerically. The actual value returned will be of the original type with no conversion applied.
Be careful when passing arguments of different types because max() can produce unpredictable results.
valueAny comparable value.
valuesAny comparable values.
value_arrayAn array containing the values.
max() returns the parameter value considered "highest" according to standard
comparisons. If multiple values of different types evaluate as equal (e.g. 0
and 'abc') the first provided to the function will be returned.
If an empty array is passed, then false will be returned and an
E_WARNING error will be emitted.
Example #1 Example uses of max()
<?php
echo max(2, 3, 1, 6, 7); // 7
echo max(array(2, 4, 5)); // 5
// The string 'hello' when compared to an int is treated as 0
// Since the two values are equal, the order they are provided determines the result
echo max(0, 'hello'); // 0
echo max('hello', 0); // hello
// Here we are comparing -1 < 0, so 'hello' is the highest value
echo max('hello', -1); // 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)
// Multiple arrays of the same length are compared from left to right
// so in our example: 2 == 2, but 5 > 4
$val = max(array(2, 4, 8), array(2, 5, 1)); // array(2, 5, 1)
// If both an array and non-array are given, the array will be returned
// as comparisons treat arrays as greater than any other value
$val = max('string', array(2, 5, 7), 42); // array(2, 5, 7)
// If one argument is NULL or a boolean, it will be compared against
// other values using the rule FALSE < TRUE regardless of the other types involved
// In the below example, -10 is treated as TRUE in the comparison
$val = max(-10, FALSE); // -10
// 0, on the other hand, is treated as FALSE, so is "lower than" TRUE
$val = max(0, TRUE); // TRUE
?>