浅析php中array函数的使用方法

//直接声明$colors = array("red", "green", "blue");//使用键值对$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");//空数组$emptyArray = array();

//访问数字下标$colors = array("red", "green", "blue");echo $colors[1];  //输出 "green"//访问字符串下标$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");echo $age["Ben"];  //输出 "37"

//修改数组元素$colors = array("red", "green", "blue");$colors[0] = "yellow";   //将第一个元素从"red"改为"yellow"print_r($colors);   //输出 Array ( [0] => yellow [1] => green [2] => blue )//删除数组元素$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");unset($age["Ben"]);   //删除元素"Ben"print_r($age);   //输出 Array ( [Peter] => 35 [Joe] => 43 )

//for循环遍历数组$colors = array("red", "green", "blue");for ($i = 0; $i < count($colors); $i++) {    echo $colors[$i] . "
";}//foreach循环遍历数组$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");foreach($age as $x => $x_value) {    echo "Key=" . $x . ", Value=" . $x_value;}//while循环遍历数组$colors = array("red", "green", "blue");$i = 0;while($i < count($colors)) {    echo $colors[$i] . "
";    $i++;}

//使用sort()函数升序排列数组$numbers = array(4, 2, 8, 5, 1);sort($numbers);print_r($numbers);   //输出 Array ( [0] => 1 [1] => 2 [2] => 4 [3] => 5 [4] => 8 )//使用rsort()函数降序排列数组$numbers = array(4, 2, 8, 5, 1);rsort($numbers);print_r($numbers);   //输出 Array ( [0] => 8 [1] => 5 [2] => 4 [3] => 2 [4] => 1 )

//使用array_merge()函数合并数组$a1=array("red","green");$a2=array("blue","yellow");print_r(array_merge($a1,$a2));   //输出 Array ( [0] => red [1] => green [2] => blue [3] => yellow )

//使用in_array()函数查找数组$colors = array("red", "green", "blue");if(in_array("red",$colors)) {    echo "found!";} else {    echo "not found!";}