10 PHP functions practical but not common, PHP function practical _php Tutorial

10 PHP functions practical but not common, PHP function practical

1. Sys_getloadavg ()

SYS_GETLOADAVT () can obtain the system load condition. The function returns an array of three elements, each representing the average load for the system in the past 1, 5, and 15 minutes. Instead of letting the server down because of high load, it is better to die out a script when the system is heavily loaded, Sys_getloadavg () is used to help you achieve this function. Unfortunately, this function is not valid under Windows.

2. Pack ()

Pack () can save storage space by converting the 32-bit 16 binary string returned by MD5 () to a 16-bit binary string.

3. Cal_days_in_month ()

Cal_days_in_month () is able to return the number of days in a specified month.

4. _ ()

WordPress developers often see this function, as well as _e (). The functions of the two functions are the same and are used in conjunction with the GetText () function to enable multilingual Web sites. Refer to the relevant section of the PHP manual for details.

5. Get_browser ()

Is it good to see what the user's browser can do before sending the page? Get_browser () can get the user's browser type, as well as the features supported by the browser, but first you need a Php_browscap.ini file to make a reference file for the function.

It is important to note that the function of the browser is based on the general characteristics of the browser. For example, if a user turns off browser support for JavaScript, the function is not aware of this. However, the function is accurate in judging the browser type and OS platform.

6. Debug_print_backtrace ()

This is a debugging function that can help you find logic errors in your code. To understand this function, just look at an example:

 $a = 0;  function iterate () {global $a;  if ($a <) recur (); echo $a.  “, “;  } function recur () {global $a;  $a + +;  How do I get here?  echo "\n\n\n";  Debug_print_backtrace ();  if ($a <) iterate ();  } iterate (); # OUTPUT: #0 recur () called at [C:\htdocs\php_stuff\index.php:8] #1 iterate () called at [c:\htdocs\php_stuff\index.php:2 5] #0 recur () called at [C:\htdocs\php_stuff\index.php:8] #1 iterate () called at [c:\htdocs\php_stuff\index.php:21] #2  Recur () called at [C:\htdocs\php_stuff\index.php:8] #3 iterate () called at [c:\htdocs\php_stuff\index.php:25] #0 recur ()  Called at [C:\htdocs\php_stuff\index.php:8] #1 iterate () called at [c:\htdocs\php_stuff\index.php:21] #2 recur () called at [C:\htdocs\php_stuff\index.php:8] #3 iterate () called at [c:\htdocs\php_stuff\index.php:21] #4 recur () called at [C: \htdocs\php_stuff\index.php:8] #5 iterate () called at [c:\htdocs\php_stuff\index.php:25] 

7. Metaphone ()

This function returns the Metaphone value of the word, with the same pronounced word having the same Metaphone value, which means that the function can help you determine whether the two words are pronounced the same.

8. Natsort ()

Natsort () can arrange an array in a natural sort order, looking directly at an example:

$items = Array (  "apples", "5 apples", "apples", "apples"  );  Normal sorting:  sort ($items);  Print_r ($items);  # Outputs:  # Array  # (  # [0] = + Apples  # [1] = Apples  # [2] = 5 apples  # [3 ] = Apples  #)  Natsort ($items);  Print_r ($items);  # Outputs:  # Array  # (  # [2] = 5 apples  # [3] = apples  # [0] = + Apples  # [ 1] = apples  

9. Levenshtein ()

Levenshtein () tells you the "distance" between the two words. It tells you how many letters you need to insert, replace, and delete if you want to turn one word into another.

Let's look at an example:

$dictionary = Array (  "PHP", "JavaScript", "CSS"  );  $word = "japhp";  $best _match = $dictionary [0];  $match _value = Levenshtein ($dictionary [0], $word);  foreach ($dictionary as $w) {  $value = Levenshtein ($word, $w);  if ($value < $match _value) {  $best _match = $w;  $match _value = $value;  }  }  

Glob ()

Glob () will make you feel stupid to find files with Opendir (), Readdir () and Closedir ().

foreach (Glob ("*.php") as $file)  

10 PHP functions practical but not common, hurry up and collect them.

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