20 lines
499 B
PHP
20 lines
499 B
PHP
<?php
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/** 空值不参与，字典序，MD5 小写 */
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function build_sign(array $params, string $secretKey): string {
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unset($params['Sign']);
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ksort($params, SORT_STRING);
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$parts = [];
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foreach ($params as $k => $v) {
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if ($v === null) {
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continue;
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}
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$s = (string)$v;
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if ($s === '') {
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continue;
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}
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$parts[] = $k . '=' . $s;
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}
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$raw = implode('&', $parts) . '&SecretKey=' . $secretKey;
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return md5($raw);
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}
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