In order to use posix_getpid on Fedeora 11 and up you have to install php-process
# yum install php-process(PHP 4, PHP 5, PHP 7, PHP 8)
posix_getpid — Return the current process identifier
This function has no parameters.
Returns the identifier, as an int.
Example #1 Example use of posix_getpid()
<?php
echo posix_getpid(); //8805
?>In order to use posix_getpid on Fedeora 11 and up you have to install php-process
# yum install php-processSince upgrading fedora 10 to 12, I discovered that posix_getpid() disappeared and not compiled in by default, as it specifies here.
It turns out that it had been moved into package php-process.
Just do "yum install php-process", and all should be sweet again.
Hope this saves someone half an hour of research.You can use this code in windows or if you system has no posix support:
<?php
if (!function_exists('posix_getpid')) {
    function posix_getpid() {
        return getmypid();
    }
}A fall back function:
<?php
    function get_current_id() {
        if(!function_exists(posix_getpid()))
            return getmypid();
        
        return posix_getpid();
    }
?>