reference/gmp/book.xml
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<preface xml:id="intro.gmp">
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&reftitle.intro;
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<simpara>
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These functions allow you to work with arbitrary-length integers
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using the GNU <acronym>MP</acronym> library.
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</simpara>
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<simpara>
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These functions have been added in PHP 4.0.4.
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These functions allow for arbitrary-length integers to be worked with using
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the GNU <acronym>MP</acronym> library.
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</simpara>
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<note>
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<para>
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Most GMP functions accept GMP number arguments. These are shown in this
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documentation as <classname>GMP</classname> objects; however note that PHP
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5.5 and earlier represented GMP numbers as <type>resource</type>s. Most
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documentation as <classname>GMP</classname> objects. Most
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of these functions will also accept numeric and string arguments, so long
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as it is possible to convert the latter to a number. Also, if there is a
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faster function that can operate on integer arguments, it would be used
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instead of the slower function when the supplied arguments are integers.
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This is done transparently, so the bottom line is that you can use
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integers in every function that expects GMP number. See also the
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as it is possible to convert the latter to a number. Also, if there is a
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more performant function that can operate on the arguments (integers only),
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then it will be used instead (this is done transparently). See also the
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<function>gmp_init</function> function.
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</para>
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</note>
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<note>
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<para>
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From PHP 5.6 onwards, you can use
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From PHP 5.6 onwards, the
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<link linkend="language.operators.arithmetic">arithmetic</link>,
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<link linkend="language.operators.bitwise">bitwise</link> and
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<link linkend="language.operators.bitwise">bitwise</link>, and
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<link linkend="language.operators.comparison">comparison</link> operators
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with the <classname>GMP</classname> objects returned from
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may be used with the <classname>GMP</classname> objects returned from
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<function>gmp_init</function> and other GMP functions.
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</para>
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</note>
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<warning>
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<simpara>
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If you want to explicitly specify a large integer,
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specify it as a string. If you don't do that, PHP will
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interpret the integer-literal first, possibly resulting
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in loss of precision, even before <literal>GMP</literal>
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comes into play.
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Large integers must be specified as strings - otherwise, PHP will coerce
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them to floats, resulting in a loss of precision.
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</simpara>
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</warning>
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<note>
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<simpara>
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This extension is available on Windows platforms since PHP 5.1.0.
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This extension is available on Windows platforms.
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</simpara>
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</note>
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</preface>
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