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Table of Contents
Use str_replace and ucwords combination
Use regular expressions to get into place in one step
Pay attention to case and special character issues
Home Backend Development PHP Tutorial PHP convert snake_case to camelCase string

PHP convert snake_case to camelCase string

Jul 11, 2025 am 02:04 AM
php Name conversion

There are two methods to convert snake_case to camelCase in PHP: 1. Use str_replace and ucwords to combine, first capitalize the first letter of the underscore, then remove the underscore, and finally use lcfirst to ensure lowercase; 2. Use preg_replace_callback regular expression to complete the conversion step by step, match the lowercase letters after the underscore and convert them to uppercase; In addition, if the input may be in all capital format, it is recommended to convert to lowercase first to ensure consistency. At the same time, pay attention to the underscore when processing strings containing numbers or other symbols, you should ensure that letters are after underscore.

PHP convert snake_case to camelCase string

Handling string conversion is a common requirement in PHP development, especially when dealing with variable names, database field mapping, or API interface naming styles. If you have a string in snake_case format and want to convert it to camelCase , the method is actually not difficult, but there are several details that need to be paid attention to.

PHP convert snake_case to camelCase string

Use str_replace and ucwords combination

This is the most common practice, and it is clear and easy to understand:

 $snake = "this_is_a_test";
$camel = str_replace('_', '', ucwords($snake, '_'));
  • ucwords($snake, '_') will capitalize the first letter of the character after _ and turn it into "This_Is_A_Test" .

    PHP convert snake_case to camelCase string
  • Then use str_replace('_', '', ...) to remove the underscore, and the final result is "ThisIsATest" .

  • If you want to return a lowercase camelCase (i.e. camelCase instead of CamelCase ), you can add a sentence:

    PHP convert snake_case to camelCase string
     $camel = lcfirst($camel);

This approach works for most standard scenarios, and the code is concise and clear.


Use regular expressions to get into place in one step

If you prefer a more compact writing method, you can also use preg_replace_callback to handle it:

 $snake = "this_is_a_test";
$camel = preg_replace_callback('/_([az])/', function($match) {
    return strtoupper($match[1]);
}, $snake);

The meaning of this rule is: find all the lowercase letters followed by the underscore and turn it into capital. This way, the underscore is directly removed and the letters at the end become capitalized.

  • The advantage is that it does not need to be processed in steps, and it can be done in one line.
  • The disadvantage is that people who are not very familiar with the rules may be a bit troublesome to read.

Pay attention to case and special character issues

Sometimes the string passed in may be a snake_case in all capitals, such as "THIS_IS_A_TEST" . The above method is still applicable at this time, but if you want to ensure that you enter a unified format, you can do a lowercase conversion before processing:

 $snake = strtolower($input);

In addition, if there are numbers or other symbols in the string, don’t worry too much, just make sure that the underscore is followed by the letters. For example, "user_name_2nd" will be correctly converted to "userName2nd" .


Basically that's it. Although the conversion seems simple, in actual development, you should pay attention to whether the input format is standardized and whether the original case needs to be retained. Mastering these two commonly used methods can generally be easily dealt with.

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