Which of the following is NOT a valid data type in PHP?*charintegerfloatboolean

To determine which option is NOT a valid data type in PHP among the given choices, we can analyze each option:

1. char: This is not a recognized data type in PHP. In PHP, single characters are treated as strings, so there is no specific "char" type.
2. integer: This is a valid data type in PHP. It represents whole numbers.
3. float: This is also a valid data type in PHP. It represents floating-point numbers, or numbers with decimals.
4. boolean: This is a valid data type in PHP, representing either true or false.

Conclusion

Thus, the answer is char, as it is NOT a valid data type in PHP.