(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
gmp_sign — Sinal do número
Retorna 1 se num for positivo,
-1 se num for negativo,
e 0 se num for zero.
Exemplo #1 Exemplo de gmp_sign()
<?php
// positivo
echo gmp_sign("500") . "\n";
// negativo
echo gmp_sign("-500") . "\n";
// zero
echo gmp_sign("0") . "\n";
?>O exemplo acima produzirá:
1 -1 0
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.