（1）array_rand(array,number) //number指定返回随机( 键名 )的多少
<?php
$a=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
print_r(array_rand($a,1));
?>
返回数为1，将返回一个随机键名
<?php
$a=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
print_r(array_rand($a,2)); //Array ( [0] => a [1] => d )
?>
返回数多个，将返回随机带键名的数组,经常与array_flip()配合使用
（2）range(from,to,length);
print_r(range(0,20,2));
第三个参数是数组元素之间的步长
（3）数组遍历
foreach有两种遍历方式，带键名与不带键名，只能遍历数组与对象
$list = array('weidapao',"jack","ugly",'breast','army','joe');
for($i = 0;$i < count($list);$i++){
echo $list[$i]."<br>";
};
foreach ($list as $key => $value) {
echo $value."<br>";
}
echo "<br>";
$hotStone = [
'战士' => '奥金斧',
'猎人'=>'恐龙学',
'法师'=>'法力浮龙',
'牧师'=>'龙息药水',
'萨满'=>'蛮鱼图腾'
];
foreach($hotStone as $key=>$val){
echo '职业是:'.$key.'-特点是:'.$val.'<br>';
};
while($a = each($list)){
echo $a['key']."-".$a['value'].'<br>';
}
（4）list解构赋值
$hero = array("weien","blind","crocodile");
list($adc,$jungle,$top) = $hero;
echo "abc 是 $adc | jungle 是 $jungle | top 是 $top";
（5）不改变原数组的一些数组方法
$multi = array(5,8,9,7,6,6,5,5);
$unique = array_unique($multi);
print_r($unique); //不会改变原数组
array_flip(array); 交换数组的键名与键值
$relative = array('name'=>'weiwei','age'=>22,'salary'=>2200);
$turnover = array_flip($relative);
print_r($turnover); //交换数组的键名与键值
（6）排序函数
ksort() 函数对关联数组按照键名进行升序排序
请使用asort() 函数对关联数组按照键值进行升序排序
（7）数组插入方式
$table = array();
$table[] = 'watar';
$table[] = 'rice';
$table[] = 'salt';
print_r($table); //Array ( [0] => watar [1] => rice [2] => salt )
（8）遍历二维数组
$user = [
["id"=>1,"name"=>'fighter',"salary"=>'5000'],
["id"=>2,"name"=>'hank',"salary"=>'6000'],
["id"=>3,"name"=>'brumu',"salary"=>'4000'],
["id"=>4,"name"=>'coco',"salary"=>'3000'],
["id"=>5,"name"=>'gorge',"salary"=>'2000'],
["id"=>6,"name"=>'lesbin',"salary"=>'1000']
];
foreach($user as $val){
echo '编号是:'.$val['id'];
echo '名字是:'.$val['name'];
echo '工资是:'.$val['salary'];
echo "<br>";
};
（9）去掉字符串指定分隔，并将分隔后第一个字母转大写
$test = "wei_da_pao";
function transfer($str){
$return = '';
$str = explode('_',$str);
foreach ($str as $value) {
$return .= ucfirst($value);
};
return $return;
}
//Notice: Undefined variable: return in D:\phpDemo\all\php_Basic\str_func.php on line
var_dump(transfer($test));
使用拼接字符串变量前需要先声明为字符串，不然会产生Notice警告
echo lcfirst('bady');
echo "<br>";
echo ucwords('we are the best man, you are good enough');
echo "<br>";
echo strtolower('YAKEXI');
echo "<br>";
echo strtoupper('leikesa');
image.png
- lcfirst() 把字符串中的首字符转换为小写
- ucwords() 把字符串中每个单词的首字符转换为大写
- strtoupper() 把字符串转换为大写
- strtolower() 把字符串转换为小写
