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  1. <?php
  2.  
  3. function report_memory($string = '') {
  4. 	$mem = (memory_get_usage()/1000);
  5. 	echo "$string: {$mem}kb\n";
  6. 	return $mem;
  7. }
  8.  
  9. $start = report_memory('Start of stript');
  10. echo "\n";
  11.  
  12. $array = array_fill(0,10000, 'banana');
  13.  
  14.  
  15. $diff = ($array_size = report_memory('After banana')) - $start;
  16. echo "Fill Size: {$diff}kb\n\n";
  17.  
  18. $vars = get_defined_vars();
  19.  
  20. $grew = ($first_get = report_memory('After get_defined_vars()')) - $array_size;
  21. echo "Growth from get_defined_vars(): {$grew}kb\n\n";
  22.  
  23. $vars = get_defined_vars();
  24.  
  25. $grew = report_memory('One more, for fun') - $first_get;
  26. echo "Second Get grew: {$grew}kb\n";
  27.  
  28. unset($vars);
  29.  
  30. report_memory('After unset()');
  31.  
  32. echo "\nEXTRA\n";
  33.  
  34. // direct pass to a conditional
  35. $test = (array_key_exists('filler_100000',get_defined_vars()) && is_null($filler_100000));
  36.  
  37. report_memory('After Conditional Inline');
  38.  
  39. // direct pass to function
  40. $test = count(get_defined_vars());
  41.  
  42. report_memory('After Direct Pass');
  43.  
  44. function test() {
  45. 	$all = get_defined_vars();
  46. 	return !empty($all);
  47. }
  48.  
  49. // In Fucntion
  50. $test = test();
  51.  
  52. report_memory('Use in Function');
Success #stdin #stdout 0.01s 20568KB
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stdin
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Standard input is empty
stdout
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Start of stript: 116.944kb

After banana: 622.732kb
Fill Size: 505.788kb

After get_defined_vars(): 623.6kb
Growth from get_defined_vars(): 0.86800000000005kb

One more, for fun: 624.5kb
Second Get grew: 0.89999999999998kb
After unset(): 623.02kb

EXTRA
After Conditional Inline: 623.092kb
After Direct Pass: 623.092kb
Use in Function: 623.196kb
https://ideone.com/hQzfDj
Get Defined Vars Growth
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
secret

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