Summary of hibernate basics PHP array basics

There are many php functions, and you can query the API when needed.

Copy code The code is as follows:

/*
#The array has no size limit: $arr[0]=1;$arr[1]=2; $arr=array(" 0","1");$list($num1,$num2)=$arr;
array range(int low,int high[,int step])
low minimum number, high maximum number, step step size
int array_unshift(array array,mixed vari) Insert in front of array
array_push Add to tail of array
array_shift Delete from head of array
array_pop Delete from tail of array
#Positioning array
boolean in_array(mixed needle,array haystack,[,boolean strict])
boolean array_key_exists (mixed key, array array) Search for key keys
array_search() Search for associative array values ​​
array_keys() Returns an array containing all the keys searched
array_values() Returns all values ​​of the array.
#Traverse the array
mixed key(array array)
current(array array) Get the current array value
array each(array array) Return the current key, value pair
next(array array) point to the next
prev(array array) shift Go to the previous
reset(array array) move to the first
end(array array) move to the last
#Pass the array value to the function
boolean array_walk(array &array,callback function,[,mixed userdata])
#OK The size and uniqueness of the array
integer count(array array[,int mode]) is similar to sizeof()
array array_count_values(array array) counts the number of occurrences of each value in groups
array_unique() deletes duplicate values ​​and maintains uniqueness
# Sort
array_reverse() reverse the order
array_flip() swap keys and values ​​
void sort(array array[,int sort_flags])
sort_flgs{[SORT_NUMBERIC numerical sort],[SORT_REGULAR sort by ASCII],[SORT_STRING]}
asort() ascending order
rsort() reverse order
arsort() reverse order
natsort() natural sort
natcasesort() case-insensitive natural sort
ksort() key-value sort
krsort() reverse key-value sort
void usort(array array, callback function name) User-defined sorting
#Merge, split, combine, decompose arrays
array_merge_recursive() merge
array_merge_combine() append
array_merge() connect to new array
array_slice(array array,int offse[,int length]) split
array_intersect(), array_intersect_assoc() array intersection
array_diff(), array_diff_assoc() difference
array_rand(), shuffle() random array
array_sum() sum
array_chunk into multi-dimensional arrays
*/
//Create an even array of 0-20, 2 is the step size
$even=range(0,20,2);
//Print the array
print_r($even);
//Determine whether it is an array
printf(" this number is an array:%s
",(is_array($even)?"true":"false"));
echo "
";
//Add sub-items to the head of the array , and print
array_unshift($even,522,54);
print_r($even);
//Define a variable, then search in the array, and display the found variable when it exists.
$sa=522;
if(in_array($sa,$even)){
echo "find it $sa";
};
echo "
";
//Search array key
if(array_key_exists(4,$even)){
echo $even[4]." exists.";
}
echo "
";
print_r(array_values($even));
// Traverse the print array
while($key=key($even)){
echo "
".$key;
next($even);
}
//Statistical array size
echo "< br/>";
echo count($even);
//Sort
echo "
";
sort($even);
print_r($even);
?>

The above has introduced the basics of hibernate and a summary of the basic knowledge of PHP arrays, including the basic aspects of hibernate. I hope it will be helpful to friends who are interested in PHP tutorials.