What is the usage of the php strstr function?

1 year ago
Ava Mitchell
2 minutes

The PHP strstr function is used to search for a specified string within a string, and returns the portion of the string starting from the specified string to the end of the string.

Here is how to use the function:

strstr(string $haystack, mixed $needle, bool $before_needle = false): string|false

Explanation of parameters:

  1. haystack: the string to search within.
  2. needle: the string to be searched for.
  3. It is an optional parameter that specifies whether to return the portion before the needle. By default, it is set to false, which returns the portion starting from the needle to the end of the string.
  4. Return Value: If the needle is found, return the part of the string from the needle to the end; if not found, return false.

Original: 我今天有很多事情要做，所以可能会很忙。
Paraphrased: I have a lot of things to do today, so I might be very busy.

$str = 'Hello, world!';
$part = strstr($str, 'world');
echo $part; // 输出：world!

$part2 = strstr($str, 'world', true);
echo $part2; // 输出：Hello,

In the above example, strstr($str, ‘world’) will find the first occurrence of ‘world’ in the string and return the part starting from ‘world’ to the end of the string. strstr($str, ‘world’, true) will return the part before ‘world’.

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