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PHP Page generation time

In this tutorial I'll show you how to capture execution time in PHP. I bet you already have seen somewhere in the net something like:

Page generated in 0.325261 seconds

you can do it quickly with just 3 functions:

1) Function
string microtime(void)
Returns string containing two parts "msec sec",
where msec - number of microseconds
and sec - current time in seconds in timestamp format from the UNIX Epoch (0:00:00 January 1, 1970 GMT)
This function works only with operation systems supporting gettimeofday() system call.

2) Function
array explode(string separator, string string [, int limit])
This one splits source string into parts by separator and fills resulting array with all parts (or as many as specified in limit).

3) Function
void printf (string format [, mixed args])
This is completely similar to C language printf function. It will output args values by text format, specified in format argument.
Arguments:
format - text format to apply for output
args - values inserted into format

Now let's think about the logic of our task.
What do we need to do ?
First we have to get current time before code is executed. Then we will have to get current time again after the code. And at last we need to print the difference between start and end time values.

Before your main PHP code write:

//Get current time
    $mtime = microtime();
//Split seconds and microseconds
    $mtime = explode(" ",$mtime);
//Create one value for start time
    $mtime = $mtime[1] + $mtime[0];
//Write start time into a variable
    $tstart = $mtime;

Now, go to the end of your main PHP code and write after all:

//Get current time as we did at start
    $mtime = microtime();
    $mtime = explode(" ",$mtime);
    $mtime = $mtime[1] + $mtime[0];
//Store end time in a variable
    $tend = $mtime;
//Calculate the difference
    $totaltime = ($tend - $tstart);
//Output result
    printf ("Page was generated in %f seconds !", $totaltime);

Please note, that we can't use simple output (print or echo functions), cause the value we output is of the double precision type and we should specify how to output it correctly.
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