What is the usage of php_vld

php vld is one of the PECL extensions, used to view the opcode compiled by the underlying php. The method of use is: 1. Add the extension configuration in php.ini; 2. Create a php file named vld. php; 3. Output vld in the cmd window.

The operating environment of this article: Windows7 system, PHP5 version, Dell G3 computer.

PHP VLD extension usage

1. What is VLD?

Answer: vld is one of the PECL extensions, that is, we have extension=php_mysql.dll in php.ini. Its main function is to facilitate us to view the opcode compiled by the underlying php.

2. What is opcode?

3. How to install and use VLD?

1) Add VLD under PHP under windows

1. Determine the PHP version ts? nts?
First check whether there is [ in your code php5ts.dll] file, if there is one, the PHP version used is Thread Safe
Download address:
A: http://windows.php.net/downloads/pecl/releases/vld/0.12.0/
B: http://pecl.php.net/package/vld/0.12.0/windows

2. Add extension configuration to php.ini
extension=php_vld.dll

3. phpinof Check whether VLD already exists

4. Create a php file named vld.php

<?php
            echo &#39;hello world&#39;;?>

5. Output vld in the cmd window
Command line: php -dvld .active=1 D:/wnmp/www/test/vld.php

2) VLD configuration under Linux

1. Download and install VLD
wget http://pecl.php.net/get/vld-0.11.2.tgz
tar zxvf vld-0.11.2.tgz
cd ./vld-0.11.2
/usr/local/ php/bin/phpize
./configure –with-php-config=/usr/local/php/bin/php-config –enable-vld
make && make install

2. Edit php.ini file activates the vld extension:
cd /usr/local/php/lib
Add extension=vld.so

3. Restart the server: <br/> /usr/local/apache2/bin/apachectl restart

4. Create a php file named vld.php

<?php

        $a = &#39;123&#39;;        echo $a;    ?>

5. Output vld
php -dvld .active=1 ./test.php
Note: If the php environment variable is not set
/usr/local/php/bin/php -dvld.active=1 test.php

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