php常用数组函数查询手册 php中的数组 php打印数组 php声明数-PHP-Tutorial-php.cn

php数组常用函数

array_map ( callable callback,arrayarr1 [, array $… ] )

返回一个数组，该数组包含了 arr1 中的所有单元经过 callback 作用过之后的单元。 callback 接受的参数数目应该和传递给 array_map() 函数的数组数目一致。

<code><span>/*例1*/</span><span><?php </span><span><span>function</span><span>cube</span><span>( <span>$n</span> )</span>
{</span><span>return</span>( <span>$n</span>  *  <span>$n</span>  *  <span>$n</span> );
}
 <span>$a</span>  = <span>array</span>( <span>1</span> ,  <span>2</span> ,  <span>3</span> ,  <span>4</span> ,  <span>5</span> );
 <span>$b</span>  =  array_map ( <span>"cube"</span> ,  <span>$a</span> );
 print_r ( <span>$b</span> );
<span>/**
 输出
 Array
 (
     [0] => 1
     [1] => 8
     [2] => 27
     [3] => 64
     [4] => 125
 )
**/</span><span>?></span></span></code>

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<code><span><?php </span><span>/*例2*/</span><span>/*将多个数组进行合并*/</span><span>$a</span>  = <span>array</span>( <span>1</span> ,  <span>2</span> ,  <span>3</span> ,  <span>4</span> ,  <span>5</span> );
 <span>$b</span>  = <span>array</span>( <span>"one"</span> ,  <span>"two"</span> ,  <span>"three"</span> ,  <span>"four"</span> ,  <span>"five"</span> );
 <span>$c</span>  = <span>array</span>( <span>"uno"</span> ,  <span>"dos"</span> ,  <span>"tres"</span> ,  <span>"cuatro"</span> ,  <span>"cinco"</span> );
 <span>$d</span>  =  array_map ( <span>null</span> ,  <span>$a</span> ,  <span>$b</span> ,  <span>$c</span> );
 print_r ( <span>$d</span> );
<span>/*输出
Array
(
    [0] => Array
        (
            [0] => 1
            [1] => one
            [2] => uno
        )
    [1] => Array
        (
            [0] => 2
            [1] => two
            [2] => dos
        )
    [2] => Array
        (
            [0] => 3
            [1] => three
            [2] => tres
        )
    [3] => Array
        (
            [0] => 4
            [1] => four
            [2] => cuatro
        )
    [4] => Array
        (
            [0] => 5
            [1] => five
            [2] => cinco
        )
)
*/</span><span>?></span></span></code>

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range ( mixed start,mixedlimit [, number $step = 1 ] )

step表示间隔值，不写默认为1

<code><span>/*
例1，产生一组数字
*/</span><span>$nums</span> = range(<span>1</span>, <span>5</span>);
print_r(<span>$nums</span>);
<span>/*
输出:
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 )
*/</span><span>$nums</span> = range(<span>1</span>, <span>5</span>, <span>2</span>);
print_r(<span>$nums</span>);
<span>/*
输出:
Array ( [0] => 1 [1] => 3 [2] => 5 )
*/</span></code>

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<code><span>/*
例2，产生一组字母数组
*/</span><span>$array</span> = range(<span>'a'</span>,<span>'f'</span>);
print_r(<span>$array</span>);
<span>/*
输出:
Array ( [0] => a [1] => b [2] => c [3] => d [4] => e [5] => f )
*/</span><span>$array</span> = <span>array</span>(<span>'a'</span>, <span>'f'</span>, <span>2</span>);
print_r(<span>$array</span>);
<span>/*
输出:
print_r($array);
/*
输出:
Array ( [0] => a [1] => c [2] => e )
*/</span></code>

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array_merge ( array array1[,array… ] )

array_merge() 将一个或多个数组的单元合并起来，一个数组中的值附加在前一个数组的后面。返回作为结果的数组。

如果输入的数组中有相同的字符串键名，则该键名后面的值将覆盖前一个值。然而，如果数组包含数字键名，后面的值将不会覆盖原来的值，而是附加到后面。

如果只给了一个数组并且该数组是数字索引的，则键名会以连续方式重新索引。

<code><span>/*
解释:如果只给了一个数组并且该数组是数字索引的，则键名会以连续方式重新索引。
*/</span><span>$array1</span> = <span>array</span>(<span>1</span>, <span>2</span>, <span>3</span>, <span>4</span>, <span>5</span>);
<span>$array2</span> = <span>array</span>(<span>1</span>, <span>2</span>, <span>8</span>, <span>9</span>);
<span>$array3</span> = array_merge(<span>$array1</span>, <span>$array2</span>);
print_r(<span>$array3</span>);
<span>/*
输出:
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 1
    [6] => 2
    [7] => 8
    [8] => 9
)
*/</span></code>

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array_merge_recursive ( array array1[,array… ] ) 递归地合并一个或多个数组

如果输入的数组中有相同的字符串键名，则这些值会被合并到一个数组中去，这将递归下去，因此如果一个值本身是一个数组，本函数将按照相应的条目把它合并为另一个数组。然而，如果数组具有相同的数组键名，后一个值将不会覆盖原来的值，而是附加到后面。

会根据键名相同一层一层的将值进行合并

<code><span>/*
例1
*/</span><span>$ar1</span> = <span>array</span>(<span>"color"</span> => <span>array</span>(<span>"favorite"</span> => <span>"red"</span>), <span>5</span>);
<span>$ar2</span> = <span>array</span>(<span>10</span>, <span>"color"</span> => <span>array</span>(<span>"favorite"</span> => <span>array</span>(<span>'a'</span>=><span>"red"</span>), <span>"blue"</span>));
<span>$result</span> = array_merge_recursive(<span>$ar1</span>, <span>$ar2</span>);
print_r(<span>$result</span>);
<span>/*
输出:
Array
(
    [color] => Array
        (
            [favorite] => Array
                (
                    [0] => red
                    [a] => red     重点
                )
            [0] => blue
        )
    [0] => 5
    [1] => 10
)
*/</span></code>

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<code><span>/*
例2
*/</span><span>$ar1</span> = <span>array</span>(<span>"color"</span> => <span>array</span>(<span>"favorite"</span> => <span>"red"</span>), <span>5</span>);
<span>$ar2</span> = <span>array</span>(<span>10</span>, <span>"color"</span> => <span>array</span>(<span>"favorite"</span> =><span>"red"</span>, <span>"blue"</span>));
<span>$result</span> = array_merge_recursive(<span>$ar1</span>, <span>$ar2</span>);
print_r(<span>$result</span>);
<span>/*
输出:
Array
(
    [color] => Array
        (
            [favorite] => Array
                (
                    [0] => red
                    [1] => red  重点
                )
            [0] => blue
        )
    [0] => 5
    [1] => 10
)
*/</span></code>

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array_pad ( array input,intpad_size , mixed $pad_value ) 给数组增加值到指定的长度,原数组不会改变

<code><span><?php </span><span>$input</span> = <span>array</span>(<span>12</span>, <span>10</span>, <span>9</span>);
<span>$result</span> = array_pad(<span>$input</span>, <span>5</span>, <span>0</span>);
<span>// result is array(12, 10, 9, 0, 0)</span><span>$result</span> = array_pad(<span>$input</span>, -<span>7</span>, -<span>1</span>);
<span>// result is array(-1, -1, -1, -1, 12, 10, 9)</span><span>$result</span> = array_pad(<span>$input</span>, <span>2</span>, <span>"noop"</span>);
<span>// not padded</span><span>/*
如果size<span>?></span></span></span></code>

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array_pop ( array &$array ) 移出最后一个元素，原数组会改变

array_pop() 弹出并返回 array 数组的最后一个单元，并将数组 array 的长度减一。如果 array 为空（或者不是数组）将返回 NULL 。此外如果被调用不是一个数则会产生一个 Warning。

<code><span><?php </span><span>$stack</span> = <span>array</span>(<span>"orange"</span>, <span>"banana"</span>, <span>"apple"</span>, <span>"raspberry"</span>);
<span>$fruit</span> = array_pop(<span>$stack</span>);
print_r(<span>$stack</span>);
<span>?></span><span>/*
输出
Array
(
    [0] => orange
    [1] => banana
    [2] => apple
)
*/</span></span></code>

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array_shift() 将数组开头的单元移出数组,原数组会改变, 使用此函数后会重置（reset()）array 指针。

array_shift() 将 array 的第一个单元移出并作为结果返回，将 array 的长度减一并将所有其它单元向前移动一位。所有的数字键名将改为从零开始计数，文字键名将不变。如果 array 为空（或者不是数组）将返回 NULL

array_push()
reset()
end()
test() 格式化输出数组
array_rand()
array_replace()
array_reverse()
array_sum()
sort() 将值排序完成后，会是一个索引数组,即便原来是一个关联数组
usort()
rsort()
ksort()
krsort()
uksort()
asort()
arstor()
in_array()
array_splice()

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