PHP limit length of every string in array

Question

I have an array with multiple strings, like this:

$str[0] = \"kasdnkjsandjabsdkjsbad\";
$str[1] = \"kasdnkjsandjasdjksabdjkasbkjdsak\";
$str[2] = \"kasdnkjsa         


        

Answer 1

I am assuming you want to iterate through each string in the array and trim it to a specific length.

Create a function that does this to a single string (as an argument). Use array_map to apply this function to each element in the array.

Try this yourself - if you have any problems, append your attempt to your question.

Answer 2

Well, theoretically, this is pretty simple: just create a function that will "limit" the length of the string, and if it's too long, strip it off:

<?php

$str = array( );
$str[0] = "kasdnkjsandjabsdkjsbad";
$str[1] = "kasdnkjsandjasdjksabdjkasbkjdsak";
$str[2] = "kasdnkjsandsadbaskjdbsakjdbasdsadjsadjksabdk";
$str[3] = "kasdnkjsandasdjbaskdbjsakbdkjsabdjksabdkjsabdjkasbdjksa";
$str[4] = "kasdnkjsandsajdbaskjdbjksabdjkbasjkdbjksadbjksadbjksadbjksadbkjsa";
$str[5] = "kasdnkjsandasdjbsakdjbsakjdbsakjdsakjdbjksabdjksabdkjasbkjdasbkjdbsakjdsabjk";

$length = 10;

$substr = function( $element ) use ( $length ) {
    return substr( $element, 0, $length );
};

$str = array_map( $substr, $str ); 

var_dump( $str );

EDIT: if you want to "limit" the number of characters while adding them to the array, you can simply create a check in a function:

<?php

function append( &$array, $value, $length = 25 ) {
    if( mb_strlen( $value ) > $length ) {
        return false;
    }
    return $array[] = $value;
}

$strings = array( );

append( $strings, 'kasdnkjsandjabsdkjsbad' ); // is accepted.
append( $strings, 'kasdnkjsandjabsdkjsbadkasdnkjs' ); // is not accepted
append( $strings, 'kasdnkjsandsadbaskjdbsakjdbasdsadjsadjksabdk' ); // is not accepted.



// if you *really* want to exit when a value is too long:
function append_exit( $array, $value, $length = 25 ) {
    if( mb_strlen( $value ) > $length ) {
        trigger_error( 'Value is too long.', E_USER_ERROR );
        exit;
    }
    return $array[] = $value;
}

Answer 3

you could use

substr( $myString, $startInt, [$endInt] );

to limit each string to only so many characters. An Example:

for( $i = 0; $i < sizeof( $myArray ); $i++ ){
    $myArray[$i] = substr( $myString, 0, 20 );
}

That will limit the strings to 20 characters in length, if I did that right.