함수 array count value()

  다른 뜻에 대해서는 array length 문서를 참조하십시오.

  다른 뜻에 대해서는 PHP count() 문서를 참조하십시오.

count()

array_count_value()

1 POSIX Shell

FRUITS="Banana Orange Apple Orange Orange "
echo $FRUITS | tr ' ' '\n' | grep -c 'Orange'  # 3

2 PHP

PHP array_count_value() 문서를 참고하십시오.

function array_count_value($arr, $val) {
	return count(array_filter($arr, function($v) use($val) {return $v==$val;}));
}
$fruits = ['Banana', 'Orange', 'Apple', 'Orange', 'Orange'];
echo array_count_value($fruits, 'Orange');  # 3

$fruits = ['Banana', 'Orange', 'Apple', 'Orange', 'Orange'];
$acvs = array_count_values($fruits);
echo $acvs['Orange'];  # 3

3 Python

Python count() 문서를 참고하십시오.

fruits = ['Banana', 'Orange', 'Apple', 'Orange', 'Orange']
print( fruits.count('Orange') )
# 3

4 Perl

my @fruits = ('Banana', 'Orange', 'Apple', 'Orange', 'Orange');
print $k = grep { $_ eq 'Orange'  } @fruits;
# 3

5 SQL

SQL COUNT() 문서를 참고하십시오.

5.1 MySQL

mysql> SELECT * FROM fruits;
+--------+
| value  |
+--------+
| Banana |
| Orange |
| Apple  |
| Orange |
| Orange |
+--------+
5 rows in set (0.00 sec)

mysql> SELECT COUNT(*) FROM fruits WHERE value='Orange';
+----------+
| COUNT(*) |
+----------+
|        3 |
+----------+
1 row in set (0.00 sec)

6 같이 보기

• array_count_values()
• array length