PHP手册 - SUB

SUB


<?php
/*
 * Subtracts "value2" from "value1" and stores the result into "result".
 * opcode number: 2
 */
echo 1-2;
?>

Function name: (null)

Compiled variables: none

line	#	op	return	operands
6	0	SUB	~0	1,2
	1	ECHO		~0
7	2	RETURN		1