How to split a string into an array in PHP
Jul 13, 2025 am 02:59 AM
In PHP, the most common method is to split the string into an array using the exploit() function. This function divides the string into multiple parts through the specified delimiter and returns an array. The syntax is exploit(separator, string, limit), where separator is the delimiter, string is the original string, and limit is an optional parameter to control the maximum number of segments. For example, $str = "apple,banana,orange"; $arr = exploit(",", $str); The result is ["apple", "banana", "orange"]. If you encounter null values caused by continuous or head-to-tail delimiters, you can use array_filter() to remove the empty string, but be careful that it will remove false values such as 0 and null at the same time. In addition, setting the limit parameter can limit the length of the returned array, such as exploit(",", $str, 3) will return the remaining part as a whole. Common application scenarios include processing log files, dividing paths or URLs, etc.
In PHP, if you want to split a string into an array, the most common method is to use explode() function. It can cut the string into parts based on the specified delimiter and return an array.
Use exploit() to split a string
explode() is the most direct and commonly used method among PHP built-in functions. Its basic syntax is as follows:
exploit(separator, string, limit)
- separator : According to which character or string is divided.
- string : The original string to be divided.
- limit (optional): How many elements are returned at most.
For example:
$str = "apple,banana,orange";
$arr = exploit(",", $str);
// Result: ["apple", "banana", "orange"] If you are not sure if the separator is fixed, or want to deal with more complex formats, you can use preg_split() in combination with regular expressions, but for most common cases, explode() is enough.
Pay attention to the problem of separators and null values
Sometimes you will find that there are empty strings in the split array, which is usually because there are continuous delimiters in the original string or the beginning and end delimiters.
For example:
$str = "apple,,banana,";
$arr = exploit(",", $str);
// Result: ["apple", "", "banana", ""] At this time, you can use array_filter() to remove the empty value:
$arr = array_filter(explode(",", $str));
// Result: ["apple", "banana"] But be aware that array_filter() will remove all "false values" (such as empty strings, 0, null). If you need to keep 0 values, you must add additional judgments.
Control returns the length of the array
The third parameter limit of explode() can control the maximum length of the returned array. For example:
$str = "a,b,c,d,e";
$arr = exploit(",", $str, 3);
// Result: ["a", "b", "c,d,e"]As you can see, when limit is set to 3, the remaining content after the first two splits is returned as a whole. This function is very useful in some scenarios, such as taking only the first few fields.
Common usage scenarios include:
- Only the first few columns are required to process each row of data in the log file.
- Split path or URL to get content at a specific level
Basically that's it. After mastering explode() and some precautions, you can deal with most of the needs of converting strings into arrays.
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