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  1. <?php
  2.  
  3. function camelToUS1($string, $us = "-")
  4. {
  5.     // insert hyphen between any letter and the beginning of a numeric chain
  6.     $string = preg_replace('/([a-z]+)([0-9]+)/i', '$1'.$us.'$2', $string);
  7.     // insert hyphen between any lower-to-upper-case letter chain
  8.     $string = preg_replace('/([a-z]+)([A-Z]+)/', '$1'.$us.'$2', $string);
  9.     // insert hyphen between the end of a numeric chain and the beginning of an alpha chain
  10.     $string = preg_replace('/([0-9]+)([a-z]+)/i', '$1'.$us.'$2', $string);
  11.  
  12.     // Lowercase
  13.     $string = strtolower($string);
  14.  
  15.     return $string;
  16. }
  17. function camelToUS2($string, $us = "-") {
  18.     return strtolower(preg_replace(
  19.     	'/(?<=\d)(?=[A-Za-z])|(?<=[A-Za-z])(?=\d)|(?<=[a-z])(?=[A-Z])/', $us, $string));
  20. }
  21. function camelToUS3($string, $us = "-") {
  22.     return strtolower(preg_replace('/(?<!^)[A-Z]+|(?<!^|\d)[\d]+/', $us.'$0', $string));
  23. }
  24.  
  25. $test_values = [
  26.     'foo'       => 'foo',
  27.     'fooBar'    => 'foo-bar',
  28.     'foo123'    => 'foo-123',
  29.     '123Foo'    => '123-foo',
  30.     'fooBar123' => 'foo-bar-123',
  31.     'foo123Bar' => 'foo-123-bar',
  32.     'foo123bar' => 'foo-123-bar',
  33.     '123FooBar' => '123-foo-bar',
  34. ];
  35.  
  36. echo "OP:\n";
  37. foreach ( $test_values as $key => $val ) {
  38.    echo "$key: " . camelToUS1($key) .  " => " . (camelToUS1($key) == $val) . "\n";
  39. }
  40. echo "\nanubhava:\n";
  41. foreach ( $test_values as $key => $val ) {
  42.    echo "$key: " . camelToUS2($key) .  " => " . (camelToUS2($key) == $val) . "\n";
  43. }
  44. echo "\nAdrien Leber:\n";
  45. foreach ( $test_values as $key => $val ) {
  46.    echo "$key: " . camelToUS3($key) .  " => " . (camelToUS3($key) == $val) . "\n";
  47. }
  48.  
  49. ?>
Success #stdin #stdout 0.01s 52488KB
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Standard input is empty
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OP:
foo: foo => 1
fooBar: foo-bar => 1
foo123: foo-123 => 1
123Foo: 123-foo => 1
fooBar123: foo-bar-123 => 1
foo123Bar: foo-123-bar => 1
foo123bar: foo-123-bar => 1
123FooBar: 123-foo-bar => 1

anubhava:
foo: foo => 1
fooBar: foo-bar => 1
foo123: foo-123 => 1
123Foo: 123-foo => 1
fooBar123: foo-bar-123 => 1
foo123Bar: foo-123-bar => 1
foo123bar: foo-123-bar => 1
123FooBar: 123-foo-bar => 1

Adrien Leber:
foo: foo => 1
fooBar: foo-bar => 1
foo123: foo-123 => 1
123Foo: 123-foo => 1
fooBar123: foo-bar-123 => 1
foo123Bar: foo-123-bar => 1
foo123bar: foo-123bar => 
123FooBar: 123-foo-bar => 1
https://ideone.com/Mr9wN5
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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