后端开发|php教程
PHP，多维数组，实际应用
后端开发-php教程
在PHP开发中，有很大部分比例，我们是在操作数组，所以数组的学习非常关键~~
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"iwanghang", "age"=>18, "sex"=>"男", "email"=>"iwanghang@"), // $group[0] array("name"=>"queen", "age"=>14, "sex"=>"女", "email"=>"queen@"), // $group[1] array("name"=>"king", "age"=>55, "sex"=>"男", "email"=>"king@"), // $group[2] "four"=>array("name"=>"xiaoming", "age"=>8, "sex"=>"男", "email"=>"xiaoming@") ); var_dump($group[1]); // 打印结果 ： array(4) { ["name"]=> string(5) "queen" ["age"]=> int(14) // ["sex"]=> string(3) "女" ["email"]=> string(12) "queen@" } echo "
"; var_dump($group[1]["name"]); // 打印结果 ： string(5) "queen" echo "
"; var_dump($group[2]["age"]); // 打印结果 ： int(55) echo "
"; var_dump($group["four"]["email"]); // 打印结果 ： string(15) "xiaoming@" echo "
";
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[ ["name"=>"iwanghang", "age"=>18, "sex"=>"男", "email"=>"iwanghang@"], // $group[0] ["name"=>"queen", "age"=>14, "sex"=>"女", "email"=>"queen@"], // $group[1] ["name"=>"king", "age"=>55, "sex"=>"男", "email"=>"king@"], // $group[2]],[ ["name"=>"iwanghang", "age"=>18, "sex"=>"男", "email"=>"iwanghang@"], // $group[0] ["name"=>"queen", "age"=>14, "sex"=>"女", "email"=>"queen@"], // $group[1] ["name"=>"king", "age"=>55, "sex"=>"男", "email"=>"king@"], // $group[2]],[ ["name"=>"iwanghang", "age"=>18, "sex"=>"男", "email"=>"iwanghang@"], // $group[0] ["name"=>"queen", "age"=>14, "sex"=>"女", "email"=>"queen@"], // $group[1] ["name"=>"king", "age"=>55, "sex"=>"男", "email"=>"king@"], // $group[2]] ]; echo
; echo ---------- $class ----------
; print_r($class); echo ---------- $class[0] ----------
; print_r($class[0]); echo ---------- $class[0][0] ----------
; print_r($class[0][0]); echo ---------- $class[0][0][\ ame\] ----------
; print_r($class[0][0][ ame]); echo
----------- $class["group1"][0][\ ame\]) -----------
; print_r($class["group1"][0][ ame]); /*** 打印结果： ---------- $class ---------- Array ([group1] => Array ( [0] => Array ([name] => iwanghang[age] => 18[sex] => 男[email] => iwanghang@ ) [1] => Array ([name] => queen[age] => 14[sex] => 女[email] => queen@ ) [2] => Array ([name] => king[age] => 55[sex] => 男[email] => king@ ) )[0] => Array ( [0] => Array ([name] => iwanghang[age] => 18[sex] => 男[email] => iwanghang@ ) [1] => Array ([name] => queen[age] => 14[sex] => 女[email] => queen@ ) [2] => Array ([name] => king[age] => 55[sex] => 男[email] => king@ ) )[1] => Array ( [0] => Array ([name] => iwanghang[age] => 18[sex] => 男[email] => iwanghang@ ) [1] => Array ([name] => queen[age] => 14[sex] => 女[email] => queen@ ) [2] => Array ([name] => king[age] => 55[sex] => 男[email] => king@ ) ) ) ---------- $class[0] ---------- Array ([0] => Array ( [name] => iwanghang [age] => 18 [sex] => 男 [email] => iwanghang@ )[1] => Array ( [name] => queen [age] => 14 [sex] => 女 [email] => queen@ )[2] => Array ( [name] => king [age] => 55 [sex] => 男 [email] => king@ ) ) ---------- $class[0][0] ---------- Array ([name] => iwanghang[age] => 18[sex] => 男[email] => iwanghang@ ) ---------- $class[0][0][ ame] ---------- iwanghang ----------- $class["group1"][0][ ame]) ----------- iwanghang*/
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<?php /*** 销毁指定下标Demo* isset 检测变量是否存在* unset 销毁指定的变量*/ echo ---------- $arr = ["one", "two", "three". "four"]; ----------
; $arr = ["one", "two", "three", "four"]; echo ---------- isset($arr[2]) ----------
; if (isset($arr[2])){ // 打印结果：存在 echo "存在"; }else{ echo "不存在"; } echo "
"; echo ---------- print_r($arr) ----------
; print_r($arr); // 打印结果：Array ( [0] => one [1] => two [2] => three [3] => four ) echo "
"; echo ---------- unset($arr[2]) ----------
; unset($arr[2]); if (isset($arr[2])){ // 打印结果：不存在 echo "存在"; }else{ echo "不存在"; } echo "
"; echo ---------- print_r($arr) ----------
; print_r($arr); // 打印结果：Array ( [0] => one [1] => two [3] => four ) echo "
"; echo ---------- $arr[2] = null ----------
; $arr[2] = null; if (isset($arr[2])){ // 打印结果：不存在 echo "存在"; }else{ echo "不存在"; } echo "
"; echo ---------- print_r($arr) ----------
; print_r($arr); // 打印结果：Array ( [0] => one [1] => two [3] => four [2] => ) echo "
";
<?php /*** 猴子选大王* xdw 选大王* count($arr) 数组下标*/ xdw(88,5); // 30只猴子，每3只出局1只 function xdw($m, $n){ $arr = array(); $a = "a"; for ($i=0; $i1){ if ($i % $n == 0){echo $i."除以".$n."余数为0,所以删除".$arr[$i]."
";unset($arr[$i]); }else{$arr[] = $arr[$i];print_r($arr);echo "
";unset($arr[$i]); } $i++; } print_r($arr); }
