What is the output of the following code snippet?$a = 0123; echo $a;

In PHP, an integer literal starting with a leading zero is interpreted as an octal (base-8) number. The value 0123 in octal is calculated as (1 * 8^2) + (2 * 8^1) + (3 * 8^0), which equals 64 + 16 + 3 = 83. When echoed, PHP converts the integer to its decimal string representation. Option A assumes decimal interpretation, while Option C ignores the octal prefix rule. Option D is incorrect because leading zeros are valid syntax for octal literals in PHP.