Write the first PHP extension to calculate the number of arrays

: This article describes how to write the first PHP extension to calculate the number of arrays. For more information about PHP tutorials, see. Requirement: write the first PHP extension, which contains a function called maxwelldu. maxwelldu can calculate the length of the array (same as count)

Requirements: understand C/C ++ programming and be familiar with PHP programming.

System: CentOS6.5

Environment: LNMP (yum installation)

Take the first step to start writing PHP extensions, will use a tool, and this tool in the PHP source code, so we download a PHP source code, http://php.net/downloads.php

cd ~mkdir softwarecd softwarewget http://cn2.php.net/distributions/php-5.6.11.tar.gztar zxvf php-5.6.11.tar.gzcd php-5.6.11/ext

# Create an extension project. after the extension project is created, an additional sayhello folder will be added to the ext Directory. This folder is our extension project.

./ext_skel --extname=maxwellducd maxwellduvim config.m4

# Enable and remove the dnl and [-- enable-maxwelldu] lines before the PHP_ARG_ENABLE line.

PHP_ARG_ENABLE(maxwelldu, whether to enable maxwelldu support,dnl Make sure that the comment is aligned:[  --enable-maxwelldu           Enable maxwelldu support])

# Add at the end of the file

vim php_maxwelldu.hPHP_FUNCTION(maxwelldu);

# Add at the end of the file

Vim maxwelldu. c "PHP_FUNCTION (maxwelldu) {zval * arr; // declare a variable to accept the array parameter HashTable * arr_hash; // declare a HashTable variable int array_count; // declare an array length variable if (zend_parse_parameters (ZEND_NUM_ARGS () TSRMLS_CC, "a", & arr) = FAILURE) {// Determine whether the accepted array is> whether it is an array, and put the value into arr return;} arr_hash = Z_ARRVAL_P (arr ); // Convert the array to HashTable array_count = zend_hash_num_elements (arr_hash); // obtain the total number of elements RETURN_LONG (array_count) through the function provided by zend ); // return the number of elements} "# modify zend_function_entry maxwelldu_functions [] = {. the content of const zend_function_entry maxwelldu_functions [] = {PHP_FE (maxwelldu, NULL) {NULL, NULL, NULL }};"

# Packaging

# Note that the PHP installation methods may vary depending on the php-config directory.

phpize./configure --with-php-c/bin/php-configmakemake testmake install

# At this time, the extension will be automatically placed in the corresponding extension directory

# Modify the php configuration file, just like adding mysql, memcache, and other extensions

# Restart apache or php-fpm

extension=maxwelldu.soservice httpd restartservice php-fpm restart

# View Installed extensions

php -m

# You can view maxwelldu in phpinfo.

# Then you can use it in the PHP script.

 
Reference address:
Http://blog.csdn.net/heiyeshuwu/article/details/3453854
Http://www.360doc.com/content/13/1226/17/14452132_340319333.shtml
Http://www.nowamagic.net/librarys/veda/detail/1467
Http://blog.csdn.net/super_ufo/article/details/3863731
Http://www.phppan.com/2010/02/php-source-12-return_value/
Http://www.ccvita.com/496.html
                                                
The above introduces the first PHP extension to calculate the number of arrays, including the content, and hope to be helpful to friends who are interested in the PHP Tutorial.