How to check how many times something occurs in a string in PHP

I want to check how many instances of the letter a appears in a certain string. 开发者_开发百科

What is the function for this? I need it to return an integer value.

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You can use the function : substr_count

Example:

$str = "I love stackoverflow";
echo substr_count($str,'o'); // prints 3

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I suppose substr_count could do the trick ;-)

For example, this portion of code :

$str = 'abcdazerty';
echo substr_count($str, 'a');

would get you the following output :

2

And, quoting :

int substr_count  (  string $haystack  ,  
    string $needle  [,  int $offset = 0  
    [,  int $length  ]] )

substr_count() returns the number of times the needle substring occurs in the haystack string. Please note that needle is case sensitive.

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substr_count($haystack, $needle);

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substr_count is probably the most straightforward. you can also do this

$str = "I love stackovaerflowa";
print count(explode("a",$str))-1;

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you can refer to PHP string functions manual to find any function you need, http://php.net/strings