Home | 简体中文 | 繁体中文 | 杂文 | Search | ITEYE 博客 | OSChina 博客 | Facebook | Linkedin | 作品与服务 | Email

2.5. Generator 生成器

		
<?php
function week() {
    for ($i = 1; $i <= 7; $i++) {
        // Note that $i is preserved between yields.
        yield $i;
    }
}

$generator = week();
foreach ($generator as $value) {
    echo "$value\n";
}
?>
		
		
		
<?php
/* The input is semi-colon separated fields, with the first
 * field being an ID to use as a key. */

$input = <<<'EOF'
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin
operator:x:11:0:operator:/root:/sbin/nologin
games:x:12:100:games:/usr/games:/sbin/nologin
gopher:x:13:30:gopher:/var/gopher:/sbin/nologin
ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin
nobody:x:99:99:Nobody:/:/sbin/nologin
vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin
saslauth:x:499:76:"Saslauthd user":/var/empty/saslauth:/sbin/nologin
postfix:x:89:89::/var/spool/postfix:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
ntp:x:38:38::/etc/ntp:/sbin/nologin
nginx:x:498:498:Nginx web server:/var/lib/nginx:/sbin/nologin
apache:x:48:48:Apache:/var/www:/sbin/nologin
mysql:x:497:497:MySQL server:/var/lib/mysql:/bin/bash
www:x:80:80:Web Application:/www:/bin/bash
EOF;

function input_parser($input) {
    foreach (explode("\n", $input) as $line) {
        $fields = explode(':', $line);
        $id = array_shift($fields);

        yield $id => $fields;
    }
}

foreach (input_parser($input) as $id => $fields) {
    echo "$id:\n";
    foreach($fields as $item){
        echo "    $item\n";
    }
}
?>
		
		
		
<?php
function month() {
    foreach (range(1, 31) as $i) {
        yield $i;
    }
}

var_dump(iterator_to_array(month()));
?>
		
		
comments powered by Disqus