Get protocol number associated with protocol name

# getprotobyname

(PHP 4, PHP 5, PHP 7, PHP 8)

getprotobyname — Get protocol number associated with protocol name

### 说明

function getprotobyname(string `$protocol`): int|false

getprotobyname() returns the protocol number associated with the protocol `protocol` as per /etc/protocols.

### 参数

`protocol`

  The protocol name.

### 返回值

Returns the protocol number, 或者在失败时返回 `false`.

### 示例

示例 #1 getprotobyname() example

    <?php
    $protocol = 'tcp';
    $get_prot = getprotobyname($protocol);
    if ($get_prot === FALSE) {
        echo 'Invalid Protocol';
    } else {
        echo 'Protocol #' . $get_prot;
    }
    ?>

### 参见

- getprotobynumber() - Get protocol name associated with protocol number

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