Global record the running time of the program fragment to correctly locate breakpoints where the program logic takes too long

 
//Define a global variable to record time
$_timer_id = 0; 
//Function sets the global variable to record the time required for each breakpoint to run
function makeTimer( $notes, $onOff=FALSE ) 
{ 
if( $onOff ) 
{ 
global $_timer_id; 
$GLOBALS['timer'][$_timer_id][0] = microtime(TRUE); 
$GLOBALS['timer'][$_timer_id][1] = $notes; 
$_timer_id++; 
} 
} 
//Output the global runtime
function traceTimer() 
{ 
$timer_str = ''; 
$G_timer = count($GLOBALS['timer'])-1; 
if( $G_timer>0 ) 
{ 
for( $i=0;$i<$G_timer;$i++ ) 
{ 
$dif_time = number_format( ($GLOBALS['timer'][$i+1][0] - $GLOBALS['timer'][$i][0]), 3 ); 
$timer_str .= 'dif: '.$dif_time.' '.$GLOBALS['timer'][$i][1]."n"; 
} 
$dif_time = number_format( (microtime(TRUE) - $GLOBALS['timer'][$G_timer][0]), 3 ); 
$timer_str .= 'dif: '.$dif_time.' '.$GLOBALS['timer'][$G_timer][1]."n"; 
} 
return $timer_str; 
} 
 Usage:  
//The start time
makeTimer( ' LINE:'.__LINE__ ); 
$imgstrpos = strpos($str, '<img'.$imgstr); 
makeTimer( ' LINE:'.__LINE__ ); 
$str_p = substr($str_noimg, 0, $imgstrpos); 
makeTimer( ' LINE:'.__LINE__ ); 
$str_n = substr($str_noimg, $imgstrpos, strlen($str_noimg)); 
makeTimer( ' LINE:'.__LINE__ ); 
$pst_exc_imgs = $str_p.'<img '.$imgstr.'>'.$str_n." "; 
makeTimer( ' LINE:'.__LINE__ ); 
//Log it
error_log( traceTimer(), 3, '/tmp/'.basename(__FILE__).'.log' ); 
//Or direct output
echo traceTimer();