Php array string SEARCH array_search tips, array array_search

Php array string SEARCH array_search tips, array array_search

We usually use the array_search and in_array functions to search for Array strings in php.

array_search() Functions andin_array() Look for a key value in the array. If this value is found, the key name of the matching element is returned. If not found, false is returned.

However, array_search generally searches for the first string that meets the requirements in an array. If the search string contains multiple strings in the array, array_search cannot be used. At this time, we use the array_keys () function to implement search strings that contain multiple,

Take a look at the following example:

$ Array = array (0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red '); $ a = array_search ("blue", $ array); // $ a = 0; $ B = array_search ('red', $ array ); // only $ B = 1; $ p = array_keys ($ array, 'red') will be output '); // The search string contains multiple if (is_array ($ p) {foreach ($ p as $ v) {echo $ val. "appears in ". $ v. "" ;}} else {echo $ val. "appears in ". array_search ($ val, $ array ). "";}

Example 2:

$ Array = array (,); $ found = array_search (8, $ array); // call the array_search function and output the search result if ($ found) {// If the output key echo "found, the key is ". $ found;} else {// if no output error message is found, echo "not found ";}

Let's take a look at the in_array function.

In_array (value, array, type)

Type is optional. If this parameter is set to true, check whether the data to be searched is of the same type as the value of the array.

$ Arr = array ('core', 'use', 'method', 'query', 'not', 'not'); // in_array (value, array, type) $ isin = in_array ("How 2", $ arr); if ($ isin) {echo "in = ". $ isin;} else {echo "out = ". $ isin ;}

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