The use of explode and implode in PHP

##explode() function splits the string into arrays;

implode() function splits the array into The elements are combined into a string.

explode

Define array explode ( string $delimiter , string $string [, int $limit = PHP_INT_MAX ] )

Parameters: limit limits the number of results.

$str = "hi, jason, world";
print_r(explode(',', $str));
print_r(explode(',', $str, 2));

Result:

Array
(
[0] => hi
[1] => jason
[2] => world
)
Array
(
[0] => hi
[1] => jason, world
)

Exercise example: Define a string a, calculate how much the values ​​after the underscore add up, and use the split string function.

 $a='331612_1,331495_1,331461_2,331559_1,333080_1,333555_1,331448_1,331618_1,333388_1,33
 3408_1,327937_1,331615_1,331499_1';
 $arr=explode(',',$a);
 $sum=0;
 foreach ($arr as $value) {
     $ary=explode('_', $value);
     $sum+=$ary[1];
 }
 print_r($sum);

implode

Definition string implode ( string $glue , array $pieces )

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