PHP array string search Array_search tips _php Tips

PHP Search Array String We typically use Array_search and In_array two functions

array_search() function in_array() to find a key value in the array. If the value is found, the key name of the matching element is returned. Returns False if it is not found.

But Array_search generally uses the first string that matches the requirements in a search array. If the search string contains more than one array, it is not possible to use Array_search. At this point, we use the Array_keys () function to implement a search string that contains more than one array.

Take a look at the following examples:

$array = Array (0 => ' Blue ', 1 => ' Red ', 2 => ' green ', 3 => ' red '); 
$a =array_search ("Blue", $array); The output $a=0; 
$b =array_search (' Red ', $array); will only output $b=1; 
$p = Array_keys ($array, ' red ');//The searched string contains more than 
if (Is_array ($p)) {
  foreach ($p as $v) {echo $val in the array 
    . Appears in the. $v. " ";
   }
} else { 
  echo $val. " Appears in ". Array_search ($val, $array)." ";
}

Case TWO:

$array = Array (4,5,7,8,9,10); 
$found = Array_search (8, $array); Call the Array_search function and output the lookup result 
if ($found) {//If the output key 
echo "is found, the key is". $found; 
} else{//If no output error message is found 
echo "not Found"; 
}

Now let's look at the In_array function

Using In_array (Value,array,type)

Type is optional. If this parameter is set to True, the search data is checked for the same type as the value of the array.

$arr = Array (' Can ', ' how ', ' method ', ' Know ', ' no ', ' no ');
In_array (value,array,type)
$isin = In_array ("How 2", $arr);
if ($isin) {
  echo "in====". $isin;
} else{
  echo "out====". $isin;
}

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