Example of partial1 in PHP

partial1.php

<?php

function partial1(/* A */ $a, /* (A, B) => C */ callable $f) /* B => C */ {
    return function(/* B */ $b) use($a, $f) {
        return $f($a, $b);
    };
}

/* A :: String
 * B :: String
 * C :: Integer */
$similar_bar = partial1('bar', 'similar_text');

/** @var $result Integer */
$result = $similar_bar('baz');

/* Result is two because 'ba'
 * is shared by both strings. */
assert($result == 2);