The method of splitting strings by multiple delimiters in PHP is achieved through regular expressions. 1. The basic syntax is preg_split('/pattern/', $subject), for example, split by commas, colon and semicolon can be written as $parts = preg_split('/[,:;]/', $string); 2. In order to deal with spaces and other whitespace characters, you can add \\s* to the regular, such as $parts = preg_split('/\s[,;:]\s/', $string), which can automatically clear unnecessary spaces; 3. If you want to exclude null values ??caused by continuous separators, you can add the PREG_SPLIT_NO_EMPTY parameter, written as $parts = preg_split('/[,;:]/', $string, -1, PREG_SPLIT_NO_EMPTY) to avoid returning empty elements; 4. The actual example $string = "red, green; blue:yellow" will output ['red', 'green', 'blue', 'yellow'] after processing, indicating that the correct writing of the regular and combining options can effectively complete the multi-delimiter splitting task.
Using preg_split in PHP is a common requirement to split strings by multiple separators, such as if you want to cut a piece of text by commas, spaces, semicolons, or even line breaks. At this time, it is not enough to use ordinary explode , and you need to use preg_split with stronger regular expression functions.
Basic grammar and writing
The basic format of preg_split is:
preg_split('/pattern/', $subject)
If you want to split by multiple separators, such as commas, colons, and semicolons, you can write this:
$parts = preg_split('/[,:;]/', $string);
This means that whenever you encounter any one of , , : or ; , cut. This writing method is concise and practical.
Add spaces and other whitespace characters
Many times, we not only want to divide by specific symbols, but also want to remove possible spaces before and after. For example, the content entered by the user might look like this:
apple, banana; orange : grape
You can improve the regular slightly to match "Symbol arbitrary space":
$parts = preg_split('/\s*[,;:]\s*/', $string);
This \s* means "0 or more whitespace characters", which can automatically process unnecessary spaces, and the result will be cleaner.
Exclude null values ??(optional)
By default, if two delimiters are close together, such as ",," , preg_split will return an empty element. If you don't want these null values, you can add a parameter to the function:
$parts = preg_split('/[,;:]/', $string, -1, PREG_SPLIT_NO_EMPTY);
After adding PREG_SPLIT_NO_EMPTY , no empty items will be returned, which is very useful for cleaning data.
Practical example reference
Suppose you have a string like this:
$string = "red, green; blue:yellow";
Use the following code:
$parts = preg_split('/\s*[,;:]\s*/', $string);
The output result is:
['red', 'green', 'blue', 'yellow']
Basically all that is, the key point is to write the regular expressions right and then add options according to actual needs. After mastering it, it is very easy to split strings with multiple separators.
The above is the detailed content of php preg_split by multiple delimiters. For more information, please follow other related articles on the PHP Chinese website!
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