Este es un ejemplo sencillo de programación funcional y tuberías con php

functionalProgrammingExample.php

<?php

function pipe(...$functions): callable {
    return function($value) use ($functions) {
        foreach($functions as $function) {
            $value = $function($value);
        }
        return $value;
    };
}

function map(callable $function): callable {
    return function(array $values) use ($function) {
        return array_map(function($item) use ($function) { 
            return $function($item); 
        }, $values);
    };
}

function splitBy(string $string): callable {
    return function(string $value) use($string): array {
        return explode($string, $value);
    };
}

function reverseArr(): callable {
    return function(array $value): array {
        return array_reverse($value);
    };
}

function takeFirst(): callable {
    return function(array $value): ?string {
        return $value[0] ?? null;
    };
}

function takeElement(int $offset): callable {
    return function(array $value) use($offset): ?string {
        return $value[$offset] ?? null;
    };
}

function dateFormat(string $format): callable {
    return function(string $value) use($format): ?string {
        return date($format, strtotime($value));
    };
}

function enquote(): callable {
    return function(string $value) {
        return "'{$value}'";
    };
}


$formatter = pipe(
    splitBy(' '),
    reverseArr(),
    takeFirst(),
);

$input = ['prueba uno a las 09:12:22', 'prueba dos a las 10:00:00'];
$result = pipe(
    map($formatter), 
    map(enquote())
)($input);

print_r($result);