(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_scan1 — Scan for 1
$a
, int $start
)
Scans a, starting with bit
start, towards more significant bits,
until the first set bit is found.
aThe number to scan.
Ele pode ser qualquer número GMP resource, ou uma string numérica que é possível convertê-la para um número.
startThe starting bit.
Returns the index of the found bit, as an integer. If no set bit is found, -1 is returned.
Exemplo #1 gmp_scan1() example
<?php
// "1" bit is found at position 3. index starts at 0
$s1 = gmp_init("01000", 2);
echo gmp_scan1($s1, 0) . "\n";
// "1" bit is found at position 9. index starts at 5
$s2 = gmp_init("01000001111", 2);
echo gmp_scan1($s2, 5) . "\n";
?>
O exemplo acima irá imprimir:
3 9