PHP Files Writing to Many Filehandles Simultaneously - Web Development and Design | Tutorial for Java, PHP, HTML, Javascript PHP Files Writing to Many Filehandles Simultaneously - Web Development and Design | Tutorial for Java, PHP, HTML, Javascript

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Thursday, July 11, 2019

PHP Files Writing to Many Filehandles Simultaneously

PHP Files


Writing to Many Filehandles Simultaneously

Problem

You want to send output to more than one filehandle; for example, you want to log messages to the screen and to a file.

Solution

Wrap your output with a loop that iterates through your filehandles:

       function multi_fwrite($fhs,$s,$length=NULL) {
            if (is_array($fhs)) {
                 if (is_null($length)) {
                      foreach($fhs as $fh) {
                           fwrite($fh,$s);
                      }
                 } else {
                      foreach($fhs as $fh) {
                           fwrite($fh,$s,$length);
                      }
                 }
            }
       }

       $fhs = array();
       $fhs['file'] = fopen('log.txt','w') or die($php_errormsg);
       $fhs['screen'] = fopen('php://stdout','w') or die($php_errormsg);

       multi_fwrite($fhs,'The space shuttle has landed.');

Discussion

If you don’t want to pass a length argument to fwrite() (or you always want to), you can eliminate that check from your multi_fwrite(). This version doesn’t contain a $length argument:

       function multi_fwrite($fhs,$s) {
            if (is_array($fhs)) {
                 foreach($fhs as $fh) {
            fwrite($fh,$s);
                 }
            }
       }

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