What is the function of strpos() function in PHP? (Correct usage)

The PHP strpos function is used to find the first occurrence of a string. Its syntax is strpos(string, find, start), the parameter string is required, specifying the string to be searched; find is required, specifying the string to be searched.

What is the function of the strpos() function in PHP? (Correct usage)

Using PHP's strpos()  function to determine whether a string contains a certain string

//The method of judging whether a certain string contains a certain string
if(strpos('www.iid.hk','iid') !== false){
echo 'contains';
}else{
echo 'does not contain';
}

PHP strpos() function

The strpos() function returns the position of the first occurrence of a string within another string. Returns false if the string is not found.
Syntax

• strpos(string,find,start) parameter description
• string Required. Specifies the string to be searched.
• find Required. Specifies the character to look for.
• start is optional. Specifies where to start the search.

Note: This function is case sensitive. For a case-insensitive search, use the stripos() function.

Edit this paragraph example

Output: 3

The method of judging whether a certain string contains a certain string

if(strpos('www.iid.hk','iid') !== false){
echo 'contains';
}else{
echo 'does not contain';
}

Many people use the following judgment method, which is wrong

if(strpos('www.iid.hk','iid') ){
echo 'contains';
}else{
echo 'does not contain';
}

The above can also get the correct result, but the method is wrong, if (strpos('idc-gz.com','idc-gz') ), then the correct result cannot be obtained, the reason is The position starts from 0, the first position is found, it is 0, 0 in php, it is not true, the above judgment will not be true, this point must be very careful!

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