PHP執行這段代碼會經過如下4個步驟(確切的來說，應該是PHP的語言引擎Zend)
1.Scanning(Lexing) ,將PHP代碼轉換為語言片段(Tokens)
2.Parsing, 將Tokens轉換成簡單而有意義的表達式
3.Compilation, 將表達式編譯成Opocdes
4.Execution, 順次執行Opcodes，每次一條，從而實現PHP腳本的功能。
token_get_all()
將一段PHP代碼 Scanning成Tokens；
var_dump(token_get_all(‘<?php echo “Hello World”; ?>’));
Array(
[0] => Array(
[0] => 376
[1] => <?php
[2] => 1 )
[1] => Array(
[0] => 319
[1] => echo
[2] => 1 )
[2] => Array(
[0] => 379
[1] =>
[2] => 1 )
[3] => Array(
[0] => 318
[1] => “Hello World”
[2] => 1 )
[4] => ;
[5] => Array(
[0] => 379
[1] =>
[2] => 1 )
[6] => Array(
[0] => 378
[1] => ?>
[2] => 1 )
)
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