PHP中比较少用但很有用的几个函数

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<?php
function funtest() {
    $args = func_get_args();
    foreach ( $args as $k => $v ) {
        echo 'arg'.($k+1).': '.$v.'<br />';
    }
}
funtest();
funtest( 'hello' );
funtest( 'hello', 'world', 'next' );
?>

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<?php
//取得当前目录下后缀名为.php的文件
$files = glob( '*.php' );
echo '<pre>';
print_r( $files );

//当前目录下后缀名为.php和.html的文件
$files = glob( '*.{php,html}', GLOB_BRACE );
print_r( $files );

//还可以添加路径
$files = glob( './testdrive/i*.php' );
print_r( $files );

//如果你想得到绝对路径,你可以调用realpath()函数
$files = glob( './testdrive/i*.php' );
$files = array_map( 'realpath', $files );
print_r( $files );
?>

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<?php
// generate unique string
echo uniqid().'<br />';

// generate another unique string
echo uniqid().'<br />';

//该算法是根据CPU时间戳来生成的，所以在相近的时间段内，id前几位是一样的，这也方便id的排序，如果你想更好的避免重复，可以在id前加上前缀，如：

// 前缀
echo uniqid('foo_').'<br />';

// 有更多的熵
echo uniqid('',true).'<br />';

// 都有
echo uniqid('bar_',true).'<br />';
?>

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<meta charset="utf-8">
<?php
$string =
'Lorem ipsum dolor sit amet, consectetur
adipiscing elit. Nunc ut elit id mi ultricies
adipiscing. Nulla facilisi. Praesent pulvinar,
sapien vel feugiat vestibulum, nulla dui pretium orci,
non ultricies elit lacus quis ante. Lorem ipsum dolor
sit amet, consectetur adipiscing elit. Aliquam
pretium ullamcorper urna quis iaculis. Etiam ac massa
sed turpis tempor luctus. Curabitur sed nibh eu elit
mollis congue. Praesent ipsum diam, consectetur vitae
ornare a, aliquam a nunc. In id magna pellentesque
tellus posuere adipiscing. Sed non mi metus, at lacinia
augue. Sed magna nisi, ornare in mollis in, mollis
sed nunc. Etiam at justo in leo congue mollis.
Nullam in neque eget metus hendrerit scelerisque
eu non enim. Ut malesuada lacus eu nulla bibendum
id euismod urna sodales. ';
$compressed = gzcompress( $string );
echo 'Original size: '. strlen( $string ).'<br />';

echo 'Compressed size: '. strlen( $compressed ).'<br />';

echo 'Compressed string:<br />'.$compressed;
// 解压缩
$original = gzuncompress( $compressed );
echo '<br /><br />Uncompressed string:<br />'.$original;
?>