The most commonly used ini function in PHP_PHP tutorial

For PHP configuration file PHP’s most commonly used ini function

The configuration function of PHP is several ini_* functions, mainly for the operation of configuration files. There are actually four functions: ini_get, ini_set, ini_get_all, and ini_restore. Personally, the most useful ones are ini_set and ini_get.

* ini_get(): Get the option value of the configuration file

I believe many people have used this function, which is to get the value of an option in the configuration file. If it is a true value, it returns 1, if it is a false value, it returns 0, and if it is a false value, it returns a string.

For example, the example in the manual:

＜?php
/*
Our php.ini contains the following settings:

display_errors = On
register_globals = Off
post_max_size = 8M
*/
echo 'display_errors = ' . ini_get('display_errors') . "n"; //显示错误是否打开
echo 'register_globals = ' . ini_get('register_globals') . "n";//全局变量是否打开
echo 'post_max_size = ' . ini_get('post_max_size') . "n";//最多能提交的文件大小
echo 'post_max_size+1 = ' . (ini_get('post_max_size')+1) . "n";
?＞

Output:

display_errors = 1
register_globals = 0
post_max_size = 8M
post_max_size+1 = 9

This function is mainly used to obtain the configuration file, which can facilitate many operations for you. For example, you want to operate string filtering, but you don’t know whether magic_quotes_gpc is turned on, so you can write a function like this:

/* 字符串过滤函数 */
function stringFilter($str)
{
if (ini_get('magic_quotes_gpc)') {
return $str;
} else {
return addslashes($str);
}
}

Of course, if you have no way of knowing whether your global variable is open, you can also customize a function like this:

/* 变量检测函数 */
function getGetVar($var)
{
if (ini_set('register_gobals')) {
return $var;
} else {
return $_GET['var'];
}
}

Of course, you can use it for many purposes, and you can slowly experience it yourself.

* ini_set function: Set certain variable values ​​in php.ini

This function is to set the value in the option. It will take effect after the function is executed. When the script ends, this setting will also be invalid. Not all options can be set by the function. The specific values ​​that can be set can be viewed in the manual for a list.

You can set the option value in php.ini. For example, if the display_error option is turned off, but you want to display the error message in the program to facilitate your debugging the program, then you can use this function:

ini_set("display_errors", "On");

Then the program on your page will display error information, and you can also use error_reporting to set the level of error information displayed.

If you need to increase the script execution time, you can set:

ini_set("max_execution_time", "180");

Then the script execution time changes from the default 30 seconds to 180 seconds. Of course, you can also use set_time_limit() to set it.

In fact, it is very good if you combine ini_set and ini_get. For example, if you want to add your own include file path to the configuration file, but do you have permission to change php.ini, then you can combine the two functions:

ini_set('include_path',ini_get('include_path').':/your_include_dir:');

* ini_get_all: Get all setting option variables

Return all option values ​​​​in the form of an array, 3lian material, which is convenient for you to use when phpinfo() cannot be used.

Manual examples, such as:

＜?php
$inis = ini_get_all();

print_r($inis);

?＞

Partial output:

Array
(
[allow_call_time_pass_reference] =＞ Array
(
[global_value] =＞ 1
[local_value] =＞ 1
[access] =＞ 6
)
[allow_url_fopen] =＞ Array
(
[global_value] =＞ 1
[local_value] =＞ 1
[access] =＞ 7
)
...
)

* ini_restore: Restore the default value of the configuration file

It is to restore the default value of the configuration file. You can use it to restore it after you use ini_set to set it.

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