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## Which PHP String to Integer Conversion Method is Fastest: (int) or intval()?
- Susan SarandonOriginal
- 2024-10-25 09:03:02868browse
Exploring the Fastest Method for String to Integer Conversion in PHP
To efficiently convert a string like "123" to an integer in PHP, the fastest approach is typecasting using (int). This method significantly outperforms its counterpart, intval().
Performance Comparison
Benchmarking reveals that intval() is approximately two and a half times slower than (int), especially when the input is already an integer. Here are the performance results for various input types:
| Function | Time to run 1 million iterations |
|---|---|
| (int) "123" | 0.55029 |
| intval("123") | 1.0115 (183%) |
| (int) "0" | 0.42461 |
| intval("0") | 0.95683 (225%) |
| (int) int | 0.1502 |
| intval(int) | 0.65716 (438%) |
| (int) array("a", "b") | 0.91264 |
| intval(array("a", "b")) | 1.47681 (162%) |
| (int) "hello" | 0.42208 |
| intval("hello") | 0.93678 (222%) |
Handling Unexpected Input
Unexpected input, such as strings containing non-numeric characters or arrays, can be handled differently by these methods:
- (int): Truncates the non-numeric characters and returns the remaining digits.
- intval(): Returns 0 if the input is not a valid number.
Coercion vs. Typecasting
While coercion using 0 $var provides similar performance as (int) for numeric inputs, it fails for non-numeric inputs, returning an error.
Additional Considerations
When selecting a conversion method, be aware of these unexpected behaviors:
- (int) and intval() return 0 for "0x11" due to hexadecimal interpretation.
- (int) retains leading zeros in octal "011," while intval() does not.
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