<?php
// https://www.mail-archive.com/internals@lists.php.net/msg87079.html
function str_begins($a, $b) {
return substr_compare($a, $b, 0, strlen($b)) === 0;
}
function str_ends($a, $b) {
return substr_compare($a, $b, -strlen($b)) === 0;
}
// Let's test edge cases
$funcs = array(
'str_begins',
'str_ends',
);
$tests = array(
// array(array($main, $part), $expected)
array(array("foo", "foo"), true),
array(array("foo", ""), true),
array(array("", "foo"), false),
array(array("", ""), true),
);
foreach ($funcs as $func) {
foreach ($tests as $test) {
list($args, $expected) = $test;
list($main, $part) = $args;
echo $func . '("' . $main . '", "' . $part . '"):' . PHP_EOL;
echo " - Expected: "; var_dump($expected);
echo " - Actual: "; var_dump($func($main, $part));
echo PHP_EOL;
}
echo PHP_EOL;
}
- Output for 7.2.18 - 7.2.33, 7.3.5 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
- str_begins("foo", "foo"):
- Expected: bool(true)
- Actual: bool(true)
str_begins("foo", ""):
- Expected: bool(true)
- Actual: bool(true)
str_begins("", "foo"):
- Expected: bool(false)
- Actual: bool(false)
str_begins("", ""):
- Expected: bool(true)
- Actual: bool(true)
str_ends("foo", "foo"):
- Expected: bool(true)
- Actual: bool(true)
str_ends("foo", ""):
- Expected: bool(true)
- Actual: bool(false)
str_ends("", "foo"):
- Expected: bool(false)
- Actual: bool(false)
str_ends("", ""):
- Expected: bool(true)
- Actual: bool(true)
- Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.17, 7.3.0 - 7.3.4
- str_begins("foo", "foo"):
- Expected: bool(true)
- Actual: bool(true)
str_begins("foo", ""):
- Expected: bool(true)
- Actual: bool(true)
str_begins("", "foo"):
- Expected: bool(false)
- Actual:
Warning: substr_compare(): The start position cannot exceed initial string length in /in/SFFKh on line 5
bool(false)
str_begins("", ""):
- Expected: bool(true)
- Actual: bool(true)
str_ends("foo", "foo"):
- Expected: bool(true)
- Actual: bool(true)
str_ends("foo", ""):
- Expected: bool(true)
- Actual: bool(false)
str_ends("", "foo"):
- Expected: bool(false)
- Actual:
Warning: substr_compare(): The start position cannot exceed initial string length in /in/SFFKh on line 8
bool(false)
str_ends("", ""):
- Expected: bool(true)
- Actual:
Warning: substr_compare(): The start position cannot exceed initial string length in /in/SFFKh on line 8
bool(false)
preferences:
179.88 ms | 404 KiB | 214 Q