文章目录

• ​​数组​​

• ​​练习输出​​

• ​​函数​​

数组

echo "<pre>";
  $number = array(3, 5, 7, 11, 15); 
  $color = array('blue','yellow','red');
  echo $color[2][1];  //二维数组
  $color[] = 'orange';
  $color[] = 'black';
  $color[] = 'white';//**数组下标按照最大的自动下标累加  
  $color[66] = 'odds';
  print_r($color);//必须用print_r输出数组

练习输出

键-值对

$student = array(
    'name' => '张三',
    'age' => '21',
    'height' => '183.5',
    'native' => '济宁',
    'sex' => '男'
    );

数组的嵌套

$students = array(
    array(
    'name' => '李四',
    'age' => '21',
    'height' => '163.5',
    'native' => '济宁',
    'sex' => '男'
    ),
    array(
    'name' => '王五',
    'age' => '21',
    'height' => '153.5',
    'native' => '济宁',
    'sex' => '男'
    ),
    array(
    'name' => '郭千仞',
    'age' => '21',
    'height' => '183.5',
    'native' => '济宁',
    'sex' => '男'
    )
  );

foreach输出数组

foreach ($students as $value) {
    echo "大家好,我叫{$value[name]}，我今年{$value[age]}岁，我来自{$value[native]}，我是一个{$value[sex]}生，我的身高是{$value[height]}厘米<br>";

函数

function sum($a, $b, $c){
    return $a + $b + $c;
  }
  function di($a, $b){
    return $a - $b; 
  }
  function link($a, $b){
    return  $a.$b."<br>";
  }
  echo sum(1, 2, 3)."<br>";
  echo di(1, 2)."<br>";
  echo link('Hello','World');