Optimize CIDR parsing for performance

[arshidkv12]

Replaced explode() with strpos() and substr() to avoid creating an array,
reducing memory usage and improving parsing speed.

Q	A
Documentation	no
Bugfix	no
BC Break	no
New Feature	no
RFC	no
QA	yes

Tested xdebug with following code.

<?php
 

 function validateProxyCIDR_explode(mixed $cidr): bool
    {
        if (! is_string($cidr) || '' === $cidr) {
            return false;
        }

        $address = $cidr;
        $mask    = null;
        if (str_contains($cidr, '/')) { 
            $parts = explode('/', $cidr, 2); 
            assert(count($parts) >= 2); 
            [$address, $mask] = $parts; 
            $mask = (int) $mask; 
        }

        if (str_contains($address, ':')) {
            // is IPV6
            return filter_var($address, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)
                && (
                    $mask === null
                    || (
                        $mask <= 128
                        && $mask >= 0
                    )
                );
        }

        // is IPV4
        return filter_var($address, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)
            && (
                $mask === null
                || (
                    $mask <= 32
                    && $mask >= 0
                )
            );
    }





function validateProxyCIDR_str(mixed $cidr): bool
    {
        if (! is_string($cidr) || '' === $cidr) {
            return false;
        }

        $address = $cidr;
        $mask    = null;
        $pos = strpos($cidr, '/');
        if ($pos !== false) {
            $address = substr($cidr, 0, $pos);
            $mask    = (int) substr($cidr, $pos + 1);
        }

        if (str_contains($address, ':')) {
            // is IPV6
            return filter_var($address, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)
                && (
                    $mask === null
                    || (
                        $mask <= 128
                        && $mask >= 0
                    )
                );
        }

        // is IPV4
        return filter_var($address, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)
            && (
                $mask === null
                || (
                    $mask <= 32
                    && $mask >= 0
                )
            );
    }



// Sample test data

$cidrs = [
    '192.168.0.1',
    '10.0.0.0/8',
    '172.16.0.0/12',
    'invalid',
    '',
];

    // Benchmark loop
$iterations = 1_000;
$start = hrtime(true);

for ($i = 0; $i < $iterations; $i++) {
    foreach ($cidrs as $cidr) {
        validateProxyCIDR_str($cidr);
        validateProxyCIDR_explode($cidr);
    }
}

$end = hrtime(true);
$time_ns = $end - $start;
$time_ms = $time_ns / 1_000_000;

echo "Executed $iterations iterations in {$time_ms} ms\n";