reference/hash/functions/hash-hmac-file.xml
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Returns a string containing the calculated message digest as lowercase hexits
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unless <parameter>binary</parameter> is set to true in which case the raw
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binary representation of the message digest is returned.
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Returns &false; when <parameter>algo</parameter> is unknown or is a
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non-cryptographic hash function, or if the file
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<parameter>filename</parameter> cannot be read.
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Returns &false; if the file <parameter>filename</parameter> cannot be read.
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</para>
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</refsect1>
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<refsect1 role="errors">
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&reftitle.errors;
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<para>
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Throws a <classname>ValueError</classname> exception if
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<parameter>algo</parameter> is unknown or is a non-cryptographic hash function.
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</para>
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</refsect1>
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</thead>
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<tbody>
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<row>
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<entry>8.0.0</entry>
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<entry>
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Now throws a <classname>ValueError</classname> exception if
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<parameter>algo</parameter> is unknown or is a non-cryptographic hash
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function; previously, &false; was returned instead.
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</entry>
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</row>
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<row>
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<entry>7.2.0</entry>
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<entry>Usage of non-cryptographic hash functions (adler32, crc32, crc32b, fnv132, fnv1a32, fnv164, fnv1a64, joaat) was disabled.</entry>
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</row>
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/* Create a file to calculate hash of */
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file_put_contents('example.txt', 'The quick brown fox jumped over the lazy dog.');
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echo hash_hmac_file('md5', 'example.txt', 'secret');
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echo hash_hmac_file('sha256', 'example.txt', 'secret');
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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7eb2b5c37443418fc77c136dd20e859c
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9c5c42422b03f0ee32949920649445e417b2c634050833c5165704b825c2a53b
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]]>
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</screen>
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</example>
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