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Dec 6, 2010 · PHP check if a string contains a specific character. 8. Find first occurence numerical position in a ...
2. You can use strpos() or stripos() to check if the string contain the given needle. It will return the position where it was found, otherwise will return FALSE. Use the operators === or `!== to differ FALSE from 0 in PHP. answered Mar 8, 2013 at 23:52.
Nov 27, 2012 · Both return false if nothing is found. It's very important to note that you cannot check for "falsy", it has to be false. Use the identical operator (=== or !==), as strpos and stristr return 0 as the 0th position, but if you use an "equal to" (== or !=) it believe that it is false.
Oct 18, 2013 · The php manual states that strstr() should not be used to check for the existence of a string inside of a string -- it recommends strpos() for efficiency reasons. The count( and )>0 can be removed and (bool) added before array_filter() to convert the empty/non-empty array to false / true respectively.
Given the fact that the requirement is to check if a string contains an integer, but doesn't say how long can it be, I believe that a regular expression approach might be better in this case. For a number like 999999999999999999 it will work, but if you try for instance with a string containing the number 9999999999999999999, which is a valid integer, it will fail.
Performance wise, you don't need to create a new string (unlike with substr) nor parse the whole string if it doesn't start with what you want. You will have a performance penalty though the 1st time you use the regex (you need to create/compile it).
I've not downvoted, but your 1st and 2nd solutions will match "000 aaaa 111", which I suppose should be considered not valid (only "000aaaa111" etc., the string shouldn't contain other chars than alphanumeric) - however the OP did not specify that "000 aaaa 111" should be considered invalid, but the given examples are suggesting that behavior.
May 10, 2016 · 42. You can verify that the trimmed string is equal to the original string and then use strpos or str_contains to find a space. echo 'has spaces, but not at beginning or end'; echo 'has spaces, but not at beginning or end'; Some more info if you're interested. If you use strpos(), in this case, you don't have to use the strict comparison to ...
Apr 7, 2013 · Regular Expressions are parsed by the PHP regex engine. The problem with your syntax is that you used the || operator. This is not a regex operator, so it is counted as part of the string. As correctly stated above, if it's counted as part of the string you're looking to match: 'bad || naughty' as a string, rather than an expression!
Mar 17, 2014 · How to check if the string has alphabets in PHP The ctype_alpha and ctype_digit doesn't help in it. is their any method?
