Search for a given value in the array, and if successful, return the first corresponding key name?

I wrote a**:

#include

template

t process(t x,t a,t n) where x is the number to find, a is the target array, and n is the size of the array.

int main()

printf("%s",process(10,a,5)==true?"true":"false");

return 0;}

n is the number of array elements, m is the number to find (double), and arr is the array (double).

bool find()

There are array mergy arrays, arrays in reverse order, and array sort, all of which have intrinsic functions that can be called directly. You can see it by looking up the manual.

Put this function together and you should know how to do it.

DescriptionMixed array search ( mixed $needle , array $haystack [,bool $strict ].

example 1 array search().

array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red');

key = array_search('green', $array); // $key = 2;

key = array_search('red', $array); // $key = 1;

For $arr2, use map mapping.

arr2 = array($arr1value => $arr2value);

echo $arr2[$arr1value];

I won't write about it.

Record the subscript of the first array, and then go to the second array to find the value of the first array subscript, OK

array filter : Filter invalid elements in the array, which can be filtered using the ** function.

array map: Handle all elements in turn using the ** function implode: turn a one-dimensional array into a string separated by a specific symbol, explode:

Convert strings separated by specific symbols to a one-dimensional arraysort ksort: sort array in ascending order array unique: deduplicate array values:

Take the value of the array and reassemble it into a new array pop: Take the element at the end of the array and delete (queue) array push: insert an element at the end of the array (queue) array sum:

Count the sum of array elements.

array column: removes the specified key from the two-dimensional array to form a one-dimensional array.

Web Links.

Ten array functions commonly used in PHP.

in_array

array_search

array_key_exists

array_values

array_filter

array_column

array_merge

array_pop

listksort

1、in_array

in_əˈrā】

Check if a value exists in the array.

2、array_search

Check whether there is a specified key name or index in the array.

4、array_values

Returns all values in the array.

5、array_filter

Use the function to filter the cells in the array.

6、array_column

Returns a column specified in the array.

7、array_merge

Merge one or more arrays.

8、array_pop

Ejects the last cell of the array (out of the stack).

9、list

Assign values from an array to a set of variables.

10、ksort

Arrays are sorted by key name.

conut($arr) counts the number of elements in the array;

foreach traverses the array.

arr = array(1,2,3,"one"=>4,5,6,7);

foreach($arr as $value)";}array_values($arr);get the value of the array keys($arr); get the key name of the array flip($arr); The values in the array are swapped with the key name (if there is a duplicate, the previous one will be overwritten by the later one).

And so on... I can't finish a day.

Common functions include number combination, array splitting, array sorting, array scrambling, array creation, array length, and array ending reversed.

Array functions allow you to access and manipulate arrays.

Supports both single-dimensional and multi-dimensional arrays.

Installing array functions is a core part of PHP.

You don't need to install to use these functions.

php 5 array function description array() to create an array.

Hello, you can say the scattered functions and usage of the data in p hp in your own words, I feel that I can't do such a question, thank you.

Found 10 in the array with an index of 8.

press any key to continue#include

int find(int a, int n, int num)return -1;

int main()

int res,n = sizeof(a)/sizeof(a[0]);

res = find(a,n,10);

if(res >= 0) printf("Found that the index of %d in the array is %d. ",10,res);

else printf("Sorry, no element with %d value found. ");

return 0;}

What language do you use, whether it's a high-level programming language or a scripting language.