gmp_sign
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
gmp_sign — Sign of number
参数
返回值
Returns 1 if num
is positive,
-1 if num
is negative,
and 0 if num
is zero.
示例
示例 #1 gmp_sign() example
<?php
// positive
echo gmp_sign("500") . "\n";
// negative
echo gmp_sign("-500") . "\n";
// zero
echo gmp_sign("0") . "\n";
?>
以上示例会输出:
1 -1 0
+添加备注
用户贡献的备注 2 notes
thomas at zilliox dot me ¶
13 years ago
Hi !
If you don't have the GMP extension, the sign function is really simple to code.
Here an example of implementation :
<?php
function sign( $number ) {
return ( $number > 0 ) ? 1 : ( ( $number < 0 ) ? -1 : 0 );
}
echo sign( 500 ); // Return 1
echo sign( -500 ); // Return -1
echo sign( 0 ); // Return 0
?>
Thomas.