Knowing which argument is used or unused helps cleaning the code and adapting the API to real world usage. The same statistical approach could be used with frameworks, components and PHP extensions : they often provide extra features that are not always used, due to learning, habits or simple (un)popularity. They often help in classic situations, and makes the code faster and less error prone. array split(string pattern, string string, int limit) Returns an array of strings formed by splitting string on boundaries formed by the regular. Those arguments are rarely used, and should be better known. This was shown in introduction, so it won’t be repeated. Sometimes, the resulting dataset has to be processed by column: there, a call to array_column() is often necessary. In a related topic, databases interfaces mostly provides the equivalent of PREG_SET_ORDER : one row is one array. Preg_match_all('/a()/', 'ab ac ad', $matches, PREG_SET_ORDER) Then, the results may be processed like a database row. If this matching via index in not convenient, or look too different from databases-related extension, there is the PREG_SET_ORDER order, which gather all the sub-patterns per finding. It is possible to match the results across the column by using the index : $matches is the first sub-pattern related to the whole match of $matches, and the third sub-pattern of $matches. The $matches contains all the strings that match the whole regex, the $matches contains all the strings that match the first sub-pattern, etc. The fact is that two representation are possible : by column or by row.īy column is the default representation : preg_match_all() stores each sub-patterns in one array dimension. With capturing sub-patterns, there may be several values to be returned. Preg_match_all() looks for patterns in the string. Preg_match_all() 4th argument allows the configuration of the result set. to avoid processing too many elements from an unchecked value.to speed up the code, as fewer exploded elements are faster to extract and return.How to make key value by explode and arrange matching key values into one key 1. php - Explode array into a key->value array. when only the firsts of the elements have to be collected, and the last may be ignored. PHP explode string key into multidimensional array with values.explode() 3rd argument $limitĮxplode()’s third argument is a limit : it caps the number of split strings to be returned. In no particular order, here are the details. iterator_to_array() 3rd argument $preserve_keys.Here are several parameters that are rather unknown, but so useful. The rest shows which arguments are rarely used : we selected the most interesting when they were used less than 1% of the time. Obviously, functions without optional arguments were omitted : there is no point counting compulsory arguments. Based on Exakat’s corpus of 2800+ PHP repositories, we checked all PHP standard functions and the usage of their parameters.
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