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Outputting arrays
Creating arrays
Testing for an array
Locating array elements
Traversing arrays
Determining array size and element uniqueness
Sorting arrays
Merging, slicing, splicing, and dissecting arrays

Outputting arrays
print_r()
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Creating arrays
array()
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list()
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range();
array range ( mixed low, mixed high[, number step] )
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Testing for an array
is_array();
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Adding and removing array elements
array_push()
int array_push ( array ⌖_array,mixed var [, mixed ...] )
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PHP´uÂe:

`$states =array( ¡®Ohio' , ¡®New York' );
array_push ( $states , ¡®California' , ¡®Texas' );
//output: array((¡®Ohio',¡®New York' , ¡®California',¡®Texas');

`

array_pop();
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PHP´uÂe:

`$states =array( ¡®Ohio' , ¡®New York' );
$state = array_pop ( $states );
//output: New York

`

array_shift();
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array_unshift();
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array_pad();
array array_pad ( array input, intpad_size, mixed pad_value )
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Locating array elements
in_array();
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array_keys();
array array_keys ( array input [,mixed search_value [, bool strict]] )
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array_key_exists();
bool array_key_exists ( mixed key,array search )
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array_values();
array array_values ( array input )
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array_search();
mixed array_search ( mixed needle,array haystack [, bool strict] )
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Traversing arrays

key();
mixed key ( array &array; )
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reset();
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each();
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current();
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end();
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next();
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prev();
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array_walk();
bool array_walk ( array &array;,callback funcname [, mixed userdata] )
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array_reverse();
array array_reverse ( array array [,bool preserve_keys] )
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PHP´uÂe:

`$states =array( ¡®Delaware' , ¡®Pennsylvania' , ¡®New Jersey' );
print_r ( array_reverse ( $states ));
//Array ([0]=>New Jersey [1]=>Pennsylvania[2]=>Delaware)
$states = array( ¡®Delaware' , ¡®Pennsylvania' , ¡®New Jersey' );
print_r ( array_reverse ( $states , 1 ));
//Array ([2]=>New Jersey [1]=>Pennsylvania[0]=>Delaware)

`

array_flip();
array array_flip ( array trans )
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PHP´uÂe:

`$trans =array( "a" => 1 , "b" => 1 , "c" => 2 );
$trans = array_flip ( $trans );
print_r ( $trans );
//Array([1]=>b[2]=>c );

`

Determining array size and element uniqueness

count();
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array_count_values();
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PHP´uÂe:

`$array= array( 1 , "hello" , 1 , "world" , "hello" );
print_r ( array_count_values ( $array ));

`

array_unique();
array array_unique ( array array )
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PHP´uÂe:

`$input =array( "a" => "green" , "red" , "b" => "green" , "blue" , "red" );
$result = array_unique ( $input );
print_r ( $result );

`

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Sorting arrays

sort();
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natsort();
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PHP´uÂe:

`$array1 = $array2 = array( "img12.png" , "img10.png" , "img2.png" , "img1.png" );
sort ( $array1 );
echo "Standard sorting\n" ;
print_r ( $array1 );

natsort ( $array2 );
echo "\nNatural order sorting\n" ;
print_r ( $array2 );

`

natcasesort();
Óe natsort()Ò»Ö£¬³ýÁ˲»Çø*Ö´oСд£¡

rsort();
Óe sort()Ò»Ö£¬Õa¸oÊÇÄaeÏoÅÅÐo¡£
asort();
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array_multisort();
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arsort();
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ksort();
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krsort();
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usort();
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Merging, slicing, splicing, and dissectingarrays

array_combine();
array array_combine ( array keys,array values )
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array_merge();
array array_merge ( array array1 [,array array2 [, array ...]] )
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PHP´uÂe:

`$array1 =array( "color" => "red" , 2 , 4 );
$array2 = array( "a" , "b" , "color" => "green" , "shape" => "trapezoid" , 4 );
$result = array_merge ( $array1 , $array2 );
print_r ( $result );

`

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PHP´uÂe:

`$array1 = array();
$array2 = array( 1 => "data" );
$result = array_merge ( $array1 , $array2 );

`

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PHP´uÂe:

`$array1 = array();
$array2 = array( 1 => "data" );
$result = $array1 + $array2 ;

`

array_merge_recursive();
array array_merge_recursive ( arrayarray1 [, array ...] )
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PHP´uÂe:

`$ar1 = array( "color" =>array( "favorite" => "red" ), 5 );
$ar2 = array( 10 , "color" => array( "favorite" => "green" , "blue" ));
$result = array_merge_recursive ( $ar1 , $ar2 );
print_r ( $result );

`

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array_slice();
array array_slice ( array array, intoffset [, int length [, bool preserve_keys]] )
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PHP´uÂe:

`$input = array( "a" , "b" , "c" , "d" , "e" );
$output = array_slice ( $input , 2 ); // returns"c", "d", and "e"
$output = array_slice ( $input , - 2 , 1 ); // returns "d"
$output = array_slice ( $input , 0 , 3 ); // returns "a","b", and "c"
// note the differences in the array keys
print_r ( array_slice ( $input , 2 , - 1 ));
print_r ( array_slice ( $input , 2 , - 1 , true ));

`

array_splice();
array array_splice ( array&input;, int offset [, int length [, array replacement]] )
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array_intersect();
array array_intersect ( arrayarray1, array array2 [, array ...] )
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PHP´uÂe:

`$array1 =array( "a" => "green" , "red" , "blue" );
$array2 = array( "b" => "green" , "yellow" , "red" );
$result = array_intersect ( $array1 , $array2 );

`

array_intersect_assoc();
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array_diff();
Óe array_intersect()ÀaËÆ£¬Ö»²»¹ýËuÊǼÆËaÊý×eµÄ²i¼¯

array_diff_assoc();
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Other useful array functions

array_rand();
mixed array_rand ( array input [,int num_req] )
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shuffle();
bool shuffle ( array &array; )
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array_sum();
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array_chunk();
array array_chunk ( array input, intsize [, bool preserve_keys] )
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