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| 21 | function fixed_length_microtime() { |
21 | function fixed_length_microtime() { |
| 22 | // This function outputs a fixed-length microtime (can be used for sorting) |
22 | // This function outputs a fixed-length microtime (can be used for sorting) |
| 23 | // Additionally, it ensures that the output is always different by waiting 1 microsecond |
23 | // Additionally, it ensures that the output is always different by waiting 1 microsecond |
| 24 | 24 | ||
| 25 | $ary = explode('.', microtime(true)); |
25 | $ary = explode('.', (string)microtime(true)); |
| 26 | if (!isset($ary[1])) $ary[1] = 0; |
26 | if (!isset($ary[1])) $ary[1] = 0; |
| 27 | $ret = $ary[0].'_'.str_pad($ary[1], 4, 0, STR_PAD_RIGHT); |
27 | $ret = $ary[0].'_'.str_pad($ary[1], 4, '0', STR_PAD_RIGHT); |
| 28 | 28 | ||
| 29 | while (true) { |
29 | while (true) { |
| 30 | $ary = explode('.', microtime(true)); |
30 | $ary = explode('.', (string)microtime(true)); |
| 31 | if (!isset($ary[1])) $ary[1] = 0; |
31 | if (!isset($ary[1])) $ary[1] = 0; |
| 32 | $ret2 = $ary[0].'_'.str_pad($ary[1], 4, 0, STR_PAD_RIGHT); |
32 | $ret2 = $ary[0].'_'.str_pad($ary[1], 4, '0', STR_PAD_RIGHT); |
| 33 | // Wait until the value changes. This ensures that the microtime will never be the same |
33 | // Wait until the value changes. This ensures that the microtime will never be the same |
| 34 | // sleep(0.1) does not work for some reason. |
34 | // sleep(0.1) does not work for some reason. |
| 35 | if ($ret != $ret2) break; |
35 | if ($ret != $ret2) break; |
| 36 | } |
36 | } |
| 37 | 37 | ||