数组的第一个元素[条件]

Question

This question already has an answer here:

• Elegant way to search an PHP array using a user-defined function 6 answers

I am looking for an elegant way to get the first (and only the first) element of an array that satisfies a given condition.

Simple example:

Input:

[
    ['value' => 100, 'tag' => 'a'],
    ['value' => 200, 'tag' => 'b'],
    ['value' => 300, 'tag' => 'a'], 
 ]

Condition: $element['value'] > 199

Expected output:

['value' => 200, 'tag' => 'b']

I came up with several solutions myself:

1. Iterate over the array, check for the condition and break when found

2. Use array_filter to apply condition and take first value of filtered:

   array_values(
       array_filter(
           $input, 
           function($e){
               return $e['value'] >= 200;
           }
       )
   )[0];
   

Both seems a little cumbersome. Does anyone have a cleaner solution? Am i missing a built-in php function?

</div>

Answer 1

There's no need to use all above mentioned functions like array_filter. Because array_filter filters array. And filtering is not the same as find first value. So, just do this:

foreach ($array as $key => $value) {
    if (meetsCondition($value)) {
        $result = $value;
        break;
        // or: return $value; in in function
    }
}

array_filter will filter whole array. So if your required value is first, and array has 100 or more elements, array_filter will still check all these elements. So, do you really need 100 iterations instead of 1? The asnwer is clear - no.