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27 | daniel-mar | 1 | <?php |
2 | |||
3 | /* |
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4 | * fixed_length_microtime() for PHP |
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5 | * Copyright 2022 Daniel Marschall, ViaThinkSoft |
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29 | daniel-mar | 6 | * Version 2022-03-08 |
27 | daniel-mar | 7 | * |
8 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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9 | * you may not use this file except in compliance with the License. |
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10 | * You may obtain a copy of the License at |
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11 | * |
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12 | * http://www.apache.org/licenses/LICENSE-2.0 |
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13 | * |
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14 | * Unless required by applicable law or agreed to in writing, software |
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15 | * distributed under the License is distributed on an "AS IS" BASIS, |
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16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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17 | * See the License for the specific language governing permissions and |
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18 | * limitations under the License. |
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19 | */ |
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20 | |||
29 | daniel-mar | 21 | function fixed_length_microtime($unique=true) { |
27 | daniel-mar | 22 | // This function outputs a fixed-length microtime (can be used for sorting) |
29 | daniel-mar | 23 | // Optionally, it ensures that the output is always different by waiting 1 microsecond |
27 | daniel-mar | 24 | |
28 | daniel-mar | 25 | $ary = explode('.', (string)microtime(true)); |
27 | daniel-mar | 26 | if (!isset($ary[1])) $ary[1] = 0; |
28 | daniel-mar | 27 | $ret = $ary[0].'_'.str_pad($ary[1], 4, '0', STR_PAD_RIGHT); |
27 | daniel-mar | 28 | |
29 | daniel-mar | 29 | if ($unique) { |
30 | // Make sure value changes by waiting 1 microsecond. |
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31 | usleep(1); |
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27 | daniel-mar | 32 | } |
33 | |||
34 | return $ret; |
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35 | } |