这次给大家带来11种PHP常用函数的知识分享，这些技能都能大大地提高我们日常开发的效率，提升我们的代码质量,下一起跟随小编来看一下。
1.高亮显示的断点调试工具(灵活实用它可以不局限于断点和backgroup):
function debug($data){
if(empty($data)){
var_dump($data);
die;
}
if(!is_array($data)){
echo "<pre style='background-color: #000;color: #fff;font-size: 14px;min-height: 100px;line-height: 50px;'>";
echo "<span style='margin-left: 20px;font-size: 18px;'>";
print_r($data);
echo "</span>";
echo "</pre>";
die;
}
echo "<pre style='background-color: #000;color: #fff;font-size: 14px;min-height: 100px;'>";
echo "<br /><br /><br /><span style='margin-left: 20px;font-size: 13px;'>";
print_r($data);
echo "</span><br /><br /><br />";
echo "</pre>";
die;
}2.递归无限极分类(要坚决鄙视写数据库操作在循环里或者写在递归里的垃圾代码)：
/* @param $data array 数据
* @param $pid int 父类关系值
* @param $parentFieldstring 父类字段
* @param $pkField string 主键字段
* return array
*/
function getTreesPro($data,$pid='0',$parentField='pid',$pkField='id'){
$tree =array();
foreach($data as $k=>$v){
if($v[$parentField] == $pid){
$temp = getTreesPro($data,$v[$pkField]);//$data是对象则改为$v－>$pkField
if(!empty($temp)){
//分层
$v['son']= getTreesPro($data,$v[$pkField]);
}
$tree[] = $v;
}
}
return $tree;
}3.数组转对象
function arrayToObject($arr){
if(is_array($arr)){
return (object) array_map(__FUNCTION__, $arr);
}else{
return $arr;
}
}4.对象转数组
function object2array(&$object) {
$object = json_decode( json_encode( $object),true);
return $object;
}5.生成唯一订单号
function generateJnlNo() {
date_default_timezone_set('PRC');
$yCode = array('A','B','C','D','E','F','G','H','I','J');
$orderSn = '';
$orderSn .= $yCode[(intval(date('Y')) - 1970) % 10];
$orderSn .= strtoupper(dechex(date('m')));
$orderSn .= date('d').substr(time(), -5);
$orderSn .= substr(microtime(), 2, 5);
$orderSn .= sprintf('%02d', mt_rand(0, 99));
//echo $orderSn,PHP_EOL; //得到唯一订单号：G107347128750079
return $orderSn;
}6.将一个二维数组转换为 HashMap，并返回结果
/**
* 用法1：
* @code php
* $rows = array(
* array('id' => 1, 'value' => '1-1'),
* array('id' => 2, 'value' => '2-1'),
*);
* $hashmap = Helper_Array::hashMap($rows, 'id', 'value');
*
* dump($hashmap);
* // 输出结果为
* // array(
* // 1 => '1-1',
* // 2 => '2-1',
* //)
* @endcode
*
* 如果省略 $value_field 参数，则转换结果每一项为包含该项所有数据的数组。
*
* 用法2：
* @code php
* $rows = array(
* array('id' => 1, 'value' => '1-1'),
* array('id' => 2, 'value' => '2-1'),
*);
* $hashmap = Helper_Array::hashMap($rows, 'id');
*
* dump($hashmap);
* // 输出结果为
* // array(
* // 1 => array('id' => 1, 'value' => '1-1'),
* // 2 => array('id' => 2, 'value' => '2-1'),
* //)
* @endcode
*
* @param array $arr 数据源
* @param string $key_field 按照什么键的值进行转换
* @param string $value_field 对应的键值
*
* @return array 转换后的 HashMap 样式数组
*/
function to_hashmap($arr, $key_field, $value_field = null){
$ret = array();
if ($value_field){
foreach ($arr as $row){
$ret[$row[$key_field]] = $row[$value_field];
}
}
else{
foreach ($arr as $row){
$ret[$row[$key_field]] = $row;
}
}
return $ret;
}7.从二位数组中，取出某字段的所有结果(包含重复结果)
如从$brandList数据中取出所有id的值:$ids = array_column($brandList,'id'); 去重结果 $ids= array_unique(array_column($brandList,'id'));
if (!function_exists('array_column')) {
/**
* Returns the values from a single column of the input array, identified by
* the $columnKey.
*
* Optionally, you may provide an $indexKey to index the values in the returned
* array by the values from the $indexKey column in the input array.
*
* @param array $input A multi-dimensional array (record set) from which to pull
* a column of values.
* @param mixed $columnKey The column of values to return. This value may be the
* integer key of the column you wish to retrieve, or it
* may be the string key name for an associative array.
* @param mixed $indexKey (Optional.) The column to use as the index/keys for
* the returned array. This value may be the integer key
* of the column, or it may be the string key name.
* @return array
*/
function array_column($input = null, $columnKey = null, $indexKey = null){
// Using func_get_args() in order to check for proper number of
// parameters and trigger errors exactly as the built-in array_column()
// does in PHP 5.5.
$argc = func_num_args();
$params = func_get_args();
if ($argc < 2) {
trigger_error("array_column() expects at least 2 parameters, {$argc} given", E_USER_WARNING);
return array();
}
if (!is_array($params[0])) {
trigger_error('array_column() expects parameter 1 to be array, ' . gettype($params[0]) . ' given', E_USER_WARNING);
return array();
}
if (!is_int($params[1])
&& !is_float($params[1])
&& !is_string($params[1])
&& $params[1] !== null
&& !(is_object($params[1]) && method_exists($params[1], '__toString'))
) {
trigger_error('array_column(): The column key should be either a string or an integer', E_USER_WARNING);
return array();
}
if (isset($params[2])
&& !is_int($params[2])
&& !is_float($params[2])
&& !is_string($params[2])
&& !(is_object($params[2]) && method_exists($params[2], '__toString'))
) {
trigger_error('array_column(): The index key should be either a string or an integer', E_USER_WARNING);
return array();
}
$paramsInput = $params[0];
$paramsColumnKey = ($params[1] !== null) ? (string) $params[1] : null;
$paramsIndexKey = null;
if (isset($params[2])) {
if (is_float($params[2]) || is_int($params[2])) {
$paramsIndexKey = (int) $params[2];
} else {
$paramsIndexKey = (string) $params[2];
}
}
$resultArray = array();
foreach ($paramsInput as $row) {
$key = $value = null;
$keySet = $valueSet = false;
if ($paramsIndexKey !== null && array_key_exists($paramsIndexKey, $row)) {
$keySet = true;
$key = (string) $row[$paramsIndexKey];
}
if ($paramsColumnKey === null) {
$valueSet = true;
$value = $row;
} elseif (is_array($row) && array_key_exists($paramsColumnKey, $row)) {
$valueSet = true;
$value = $row[$paramsColumnKey];
}
if ($valueSet) {
if ($keySet) {
$resultArray[$key] = $value;
} else {
$resultArray[] = $value;
}
}
}
return array_unique($resultArray);
}
}8.客户端缓存方法
public function cache($seconds_to_cache = 3600){
$ts = gmdate("D, d M Y H:i:s", time() + $seconds_to_cache) . " GMT";
header("Expires: $ts");
header("Pragma: cache");
header("Cache-Control: max-age=$seconds_to_cache");
}9.客户端不缓存方法
public function disCache(){
$ts = gmdate("D, d M Y H:i:s",strtotime('-1 year')) . " GMT";
header("Expires: $ts");
header("Last-Modified: $ts");
header("Pragma: no-cache");
header("Cache-Control: no-cache, must-revalidate");
}10.返回上一个页面来源
public function referer(){
return $_SERVER['HTTP_REFERER'];
}11.分页方法（在api方面用得比较多）
public function pageinfo(){
$pageinfo = new \stdClass;
$pageinfo->length = isset($_GET['length']) ? $_GET['length'] : $this->length;
$pageinfo->page = isset($_GET['page']) ? $_GET['page'] : 1;
$pageinfo->end_id = isset($_GET['end_id']) ? $_GET['end_id'] : 1;
$pageinfo->offset= $pageinfo->page<=1 ? 0 : ($pageinfo->page-1) * $pageinfo->length;
$pageinfo->totalNum = $pageinfo->totalNum? $pageinfo->totalNum : 0;
$pageinfo->totalPage = $pageinfo->totalNum / $pageinfo->length;
return $pageinfo;
