Mixing Data Types in Arrays6:07 with Alena Holligan
In this video, we'll take a look at some of the inner workings of PHP arrays so that you can get the most from your data. In particular, we'll dig into some of the details of how keys work, and what types of values you can use.
- Are case sensitive.
- Must be unique or they will be overwritten.
- Can either be an integer or a string. (The value can be of any type.)
- Can be a combination of integers and strings. Note: ksort will NOT work if numeric and string keys are mixed together.
- Strings containing valid integers will be cast to the integer type. E.g. the key "8" will actually be stored under 8. On the other hand "08" will not be cast, as it isn't a valid decimal integer.
- Floats are also cast to integers, which means that the fractional part will be truncated. E.g. the key 8.7 will actually be stored under 8.
- Bools are cast to integers, too, i.e. the key true will actually be stored under 1 and the key false under 0.
- Null will be cast to the empty string, i.e. the key null will actually be stored under "".
- Arrays and objects can not be used as keys. Doing so will result in a warning: Illegal offset type.
- If multiple elements in the array declaration use the same key, only the last one will be used as all others are overwritten.
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