PHP find and search array elements

In_array () function

The In_array () function searches for a specific value in an array rollup and returns True if this value is found, otherwise false. The form is as follows:

Boolean In_array (mixed needle,array haystack[,boolean strict]);

Look at the following example, look for the variable if Apple is already in the array, and if so, output a piece of information:

$fruit = "Apple"; $fruits Array ("Apple", "banana", "orange", "pear"); if In_array ($fruit,$fruits))      Echo "$fruit is already in the array";

The third parameter is optional, which forces In_array () to consider the type when searching.

Array_key_exists () function

If a specified key is found in an array, the function array_key_exists () returns True, otherwise false is returned. The form is as follows:

Boolean array_key_exists (mixedkey,arrayarray);

The following example searches for Apple in the array key and, if found, outputs the color of the fruit:

$fruit ["apple"] = "red"; $fruit ["banana"] = "yellow"; $fruit ["pear"] = "green"; if (array_key_exists$fruit)) {    printf("Apple's color is%s",$fruit["Apple"]);}

The result of executing this code:

Apple ' s color is red

Array_search () function

The Array_search () function searches for a specified value in an array, returns the corresponding key if found, otherwise returns false. The form is as follows:

Mixed Array_search (mixed needle,array haystack[,boolean strict])

The following example searches for a specific date in $fruits (December 7) and, if found, returns information about the corresponding state:

$fruits ["apple"] = "red"; $fruits ["banana"] = "yellow"; $fruits ["Watermelon"]= "green"; $founded Array_search $fruits ); if ($founded)      printf ("%s is founded on%s.",$founded$fruits[$founded])

The results of the program run as follows:

Watermelon was founded on green.

Array_keys () function

The Array_keys () function returns an array that contains all the keys found in the searched array. The form is as follows:

Array Array_keys (arrayarray[,mixed search_value])

If the optional parameter search_value is included, only the key that matches the value is returned. The following example outputs all the arrays found in the $fruit array:

$fruits ["apple"] = "red"; $fruits ["banana"] = "yellow"; $fruits ["Watermelon"]= "green"; $keys Array_keys ($fruits); Print_r ($keys);

The results of the program run as follows:

Array ([0] = Apple [1] = banana [2] = watermelon)

Array_values () function

The Array_values () function returns all the values in an array and automatically provides a numeric index for the returned array. The form is as follows:

Array array_values (arrayarray)

The following example gets the values of each element found in $fruits:

$fruits ["apple"] = "red"; $fruits ["banana"] = "yellow"; $fruits ["Watermelon"]= "green"; $values array_values ($fruits); Print_r ($values);

The results of the program run as follows:

Array ([0] = red [1] = yellow [2] = = green)