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1. strpos returns false if the string is not found, and 0 if it is found at the beginning. so try this: conditon. Note we use a strict comparison (===) If we don't, both types (false and false or an integer) will be coerced to the same type, and 0 when coerced to a bool is false.
Apr 1, 2013 · This can be done using strpos() function. The following code is implemented using for loop. This code is quite simple and pretty straight forward.
People coming from C may think about using the strchr function, but in PHP it's actually an alias for strstr, so strpos is a better choice. Starting from March 2024 the note has been edited and not PHP.net recommends str_contains () instead of strpos () there. str_contains () appeared in PHP 8.
No, but it is slightly faster than using strtolower() first; on average, it (stripos) seems to take about 2.5 times longer (than strpos). Then again, you can still do it ( stripos ) a million times per second, so I wouldn't worry that much about it -- premature optimization is the root of all evil.
PHP Code: <?php /* strpos that takes an array of values to match against a string * note the stupid ...
Dec 6, 2010 · To determine whether a string contains another string you can use the PHP function strpos(). int strpos ...
Oct 6, 2013 · 6. strpos() returns the position of where the needle exists in the string, so if any of those numbers are in the first position it would return 0 and your code would fail because you're doing a boolean check. Also, strpos() would never return a boolean TRUE so checking === true is incorrect. – Matt K.
strpos returns an int or boolean false. the == operator also evaluates 0 to mean false, you want to use the === operator (three equals signs) that also checks that the types being compared are the same instead of just seeing if they can be evaluated to mean the same.
strpos() does not return true when it finds a match, it returns the position of the first matching string. Watchout, if the match is a the beginning of the string it will return an index of zero which will compare as equal to false unless you use the === operator.
Oct 6, 2010 · 36. According to the PHP manual, yes- strpos() is the quickest way to determine if one string contains another. Note: If you only want to determine if a particular needle occurs within haystack, use the faster and less memory intensive function strpos () instead.
