PHP memory management function memory_get_usage() usage introduction_PHP tutorial

The following is an example of using PHP memory_get_usage():

Copy code The code is as follows:

echo memory_get_usage(), '
'; //143952
$tmp = str_repeat('http://blog.micxp.com/', 4000);
echo memory_get_usage(), '
'; / /232048
unset($tmp);
echo memory_get_usage(); //143952

The comments after the above programs represent their output (unit is byte(s)) , that is, the memory used by the PHP script at that time (excluding the memory occupied by the memory_get_usage() function itself)

As can be seen from the above example, in order to reduce memory usage, you can use the PHP unset() function to Variables no longer needed are removed. Similar ones include: PHP mysql_free_result() function, which can clear the result set obtained by querying the database that is no longer needed, so that more available memory can be obtained.

PHP memory_get_usage() can also have a parameter, $real_usage, whose value is a Boolean value. The default is FALSE, which means that the obtained memory usage does not include the memory occupied by this function (PHP memory manager); when set to TRUE, the obtained memory includes the memory occupied by this function (PHP memory manager).

So in actual programming, you can use PHP memory_get_usage() to compare the memory occupied by each method to choose which method takes up less memory.

Commonly used tests:

Use the microtime function to analyze program execution time
memory_get_usage can analyze the memory footprint
For SQL efficiency, you can use slow query to view log analysis
SQL finds bottlenecks and uses EXPLAIN to analyze them

http://www.bkjia.com/PHPjc/325948.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/325948.htmlTechArticleThe following is an example of using PHP memory_get_usage(): Copy the code as follows: echo memory_get_usage(), 'br /'; //143952 $tmp = str_repeat('http://blog.micxp.com/', 4000); echo memory_ge...