Function utf8_is_ascii

Tests whether a string contains only 7bit ASCII bytes. You might use this to conditionally check whether a string needs handling as UTF-8 or not, potentially offering performance benefits by using the native PHP equivalent if it's just ASCII e.g.;

if ( utf8_is_ascii($someString) ) {
    // It's just ASCII - use the native PHP version
    $someString = strtolower($someString);
} else {
    $someString = utf8_strtolower($someString);
}

Package: utf8
See: utf8_is_ascii_ctrl()
Located at vendor/joomla/string/src/phputf8/utils/ascii.php

Parameters summary

`string`	`$str`

Return value summary

`boolean`	TRUE if it's all ASCII