A brief discussion on PHP source code five: About the creation of array array

This article mainly introduces a brief discussion on PHP source code five: Regarding the creation of array arrays, it has a certain reference value. Now I share it with you. Friends in need can refer to it

Debugging in PHP Use cli to execute PHP files in the environment
Trace the code step by step, because I am not familiar with C and lexical analysis
The PHP files used are as follows:

 <?PHP
 $a = array(1, 2, 3);
 var_dump($a);

The code is simply traced as follows:

 ===>php_execute_script(&file_handle TSRMLS_CC);     //php_cli.c line1130
 ==> retval = (zend_execute_scripts(ZEND_REQUIRE TSRMLS_CC, NULL, 3, prepend_file_p, primary_file, append_file_p) == SUCCESS);    //    main.c 2023行
 ==> EG(active_op_array) = zend_compile_file(file_handle, type TSRMLS_CC);      //    zend.c 1126行
 ==> compiler_result = zendparse(TSRMLS_C);   //    zend_language_scanner.c  3420行==> zend-language_parse.c     2773行==>case 382:     { zend_do_init_array(&(yyval), &(yyvsp[(1) - (1)]), NULL, 0 TSRMLS_CC); }    //    zend_language_parser.c  4689行
    ==>void zend_do_init_array(znode *result, znode *expr, znode *offset, zend_bool is_ref TSRMLS_DC)    //    zend_compile.c 3348行 
 
 ==>case 380:    { zend_do_add_array_element(&(yyval), &(yyvsp[(3) - (3)]), NULL, 0 TSRMLS_CC); }//    zend_language_parser.c  4684行
    ==>void zend_do_add_array_element(znode *result, znode *expr, znode *offset, zend_bool is_ref TSRMLS_DC)    //    zend_compile.c 3371行

During the code tracking process, it was found that when the PHP source code generates a syntax tree, there is no array-related operation when encountering the array and the first number. When the comma after 1 is parsed, the zend_do_init_array function will be called to create Array

The above is just a tracking process. There is no explanation of the code. Due to my limited level, I don’t know much about lexical analysis and syntax analysis.
Another: If there is no carriage return after the last line of code in the PHP program Line break, you will see a bunch of garbled characters when reading the source code file

To be continued...

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