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Jun 16, 2017
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Update zend_compile_opcode.md #18

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c97fe96
Update zend_compile_opcode.md
zimuyang Jun 15, 2017
83bd270
Update function_implement.md
zimuyang Jun 16, 2017
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2 changes: 1 addition & 1 deletion 3/function_implement.md
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Expand Up @@ -8,7 +8,7 @@ function my_func(){
...
}
```
汇编中函数对应的是一组独立的汇编指令，然后通过call指令实现函数的调用，前面已经说过PHP编译的结果是opcode数组，与汇编指令对应，PHP用户自定义函数的实现就是将函数编译为独立的opcode数组，调用时分配独立的执行栈依次执行opcode，所以自定义函数对于zend而言并没有什么特别之处，只是将opcode进行了打包封装，实际PHP脚本中函数之外的指令整个可以认为是一个函数(或者理解为main函数更直观)。
汇编中函数对应的是一组独立的汇编指令，然后通过call指令实现函数的调用。前面已经说过PHP编译的结果是opcode数组，与汇编指令对应。PHP用户自定义函数的实现就是将函数编译为独立的opcode数组，调用时分配独立的执行栈依次执行opcode，所以自定义函数对于zend而言并没有什么特别之处，只是将opcode进行了打包封装。PHP脚本中函数之外的指令,整个可以认为是一个函数(或者理解为main函数更直观)。

```php
/* function main(){ */
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2 changes: 1 addition & 1 deletion 3/zend_compile_opcode.md
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Expand Up @@ -516,7 +516,7 @@ void zend_compile_expr(znode *result, zend_ast *ast)
```
>> __第3步：__ 上面两步已经分别生成了变量赋值的op1、op2，下面就是根据这俩值生成opcode的过程。
```c
tatic zend_op *zend_emit_op(znode *result, zend_uchar opcode, znode *op1, znode *op2)
static zend_op *zend_emit_op(znode *result, zend_uchar opcode, znode *op1, znode *op2)
{
zend_op *opline = get_next_op(CG(active_op_array)); //当前zend_op_array下生成一条新的指令
opline->opcode = opcode;
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