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<?php
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<?php
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/*
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/*
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 * fixed_length_microtime() for PHP
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 * fixed_length_microtime() for PHP
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 * Copyright 2022 Daniel Marschall, ViaThinkSoft
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 * Copyright 2022 Daniel Marschall, ViaThinkSoft
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 * Version 2022-03-03
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 * Version 2022-03-08
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 *
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 * You may obtain a copy of the License at
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 *
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 *
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 * limitations under the License.
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 */
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 */
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function fixed_length_microtime() {
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function fixed_length_microtime($unique=true) {
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        // This function outputs a fixed-length microtime (can be used for sorting)
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        // This function outputs a fixed-length microtime (can be used for sorting)
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        // Additionally, it ensures that the output is always different by waiting 1 microsecond
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        // Optionally, it ensures that the output is always different by waiting 1 microsecond
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        $ary = explode('.', (string)microtime(true));
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        $ary = explode('.', (string)microtime(true));
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        if (!isset($ary[1])) $ary[1] = 0;
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        if (!isset($ary[1])) $ary[1] = 0;
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        $ret = $ary[0].'_'.str_pad($ary[1], 4, '0', STR_PAD_RIGHT);
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        $ret = $ary[0].'_'.str_pad($ary[1], 4, '0', STR_PAD_RIGHT);
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        while (true) {
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        if ($unique) {
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                $ary = explode('.', (string)microtime(true));
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                if (!isset($ary[1])) $ary[1] = 0;
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                $ret2 = $ary[0].'_'.str_pad($ary[1], 4, '0', STR_PAD_RIGHT);
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                // Wait until the value changes. This ensures that the microtime will never be the same
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                // sleep(0.1) does not work for some reason.
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                // Make sure value changes by waiting 1 microsecond.
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                if ($ret != $ret2) break;
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                usleep(1);
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        }
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        }
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        return $ret;
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        return $ret;
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}
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}