php

array_column.php

<?php
/**
 * 从二维数组中选取指定列组成新数组
 * @param  array $dd_array   二维数组
 * @param  string | int $column_key 选取作为值的列的列名 index | key
 * @param  string | int $index_key  选取作为键的列的列明
 * @param  string $flag       列名的形式
 * @return array             返回新的一维数组
 */
function array_column($dd_array, $column_key, $index_key = 0, $flag = 'INDEX')
{
    $flag = strtoupper($flag);
    $new_array = array();

    $i = 0;
    $key = '';
    $colKey = '';
    $colValue = '';

    // 继承上层数组
    if ($flag == 'INHERIT') $newKey = &$key;
    // 索引为 指定列的值
    else if ($flag == 'COLUMN_VALUE') $newKey = &$colKey;
    // 自由索引
    else $newKey = &$i;

    // 不为空的时候返回键值数组
    if ($column_key !== false && $column_key !== null) {
        $newValue = &$colValue;
    } else {
        $newValue = &$value;
    }
    foreach ($dd_array as $key => $value) {
        $colKey = $value[$index_key];
        $colValue = $value[$column_key];
        $new_array[$newKey] = $newValue;
        $i++;
    }
    return $new_array;
}
$dd = array(
    'c111' => array('a' => 1, 'b' => 2, 'c' => 3, 4),
    'c222' => array('a' => 10, 'b' => 20, 'c' => 30, 40),
    'c333' => array('a' => 100, 'b' => 200, 'c' => 300, 400),
    'c444' => array('a' => 1000, 'b' => 2000, 'c' => 3000, 4000),
    'c555' => array('a' => 10000, 'b' => 20000, 'c' => 30000, 40000)
    );

$ddd = array_column($dd, 'b', false, 'INHERIT');
var_dump($ddd);

str2arr.php

<?php
/**
 * 字符串转数组，指定字符集
 * @param  string $str     要转换的字符串
 * @param  string $charset 字符集格式
 * @return array          转换后的数组
 */
function str2arr($str, $charset){
    $strlen = mb_strlen($str, $charset);
    $strArray = array();
    $tag = $strlen;
    while ($tag) {
        $index = $strlen-$tag;
        $strArray[] = mb_substr($str, $index, 1, $charset);
        $tag--;
    }
    return $strArray;
}

sysconvert.php

<?php
// Math.convert:
echo "Math :*******************\n";
var_dump('=====', bindec('10101023'));
var_dump('=====', dechex(121212));

// string:
// string 版 Math.convert
base_convert($number, $from, $to);

// 二进制数据与10进制互转
chr($charDec);
ord($char);

// 16进制 多字符版 chr ord
$chars = hex2bin($charHexes);
$charHexes = bin2hex($chars);

zh_split.php

<?php
/**
 * 按长度分割一个中文字符串
 * @param  string  $str    要分割的中文字符串
 * @param  integer $length 截取长度
 * @param  boolean $limit  是否有长度限制
 * @return array           返回分割后的数组
 */
function zh_split($str, $length = 1, $limit = false)
{
    if ($length < 1) throw new Exception('lenght must more than 1');
    if ($limit < 0) throw new Exception('limit must more than 0 or be a false');
    $zhs = preg_split('//u', $str, null, PREG_SPLIT_NO_EMPTY);
    $strChunks = array_chunk($zhs, $length);

    // 如果limit大于 分割后结果大小 则跳过分割
    if ($limit < count($strChunks) || $limit < 1) {
        $wholePiece = array_splice($strChunks, $limit);

        $wholeStr = '';
        array_map(function($val) use (&$wholeStr) {
            $wholeStr .= implode($val);
        }, $wholePiece);
    }

    $strs = array_map(function($vals){
        return implode($vals);
    }, $strChunks);

    if ($limit < count($strChunks) || $limit < 1) {
        return array_merge($strs, array($wholeStr));
    } else {
        return $strs;
    }
}