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<?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) ?>