Use PHP functions in JavaScript

JavaScript substr_compare

Binary safe optionally case insensitive comparison of 2 strings from an offset, up to length characters

function substr_compare (main_str, str, offset, length, case_insensitivity) {
    // Binary safe optionally case insensitive comparison of 2 strings from an offset, up to length characters  
    // 
    // version: 910.813
    // discuss at: http://phpjs.org/functions/substr_compare    // +   original by: Brett Zamir (http://brett-zamir.me)
    // +   derived from: strcasecmp, strcmp
    // *     example 1: substr_compare("abcde", "bc", 1, 2);
    // *     returns 1: 0
    if (!offset && offset !== 0) {        throw 'Missing offset for substr_compare()';
    }
 
    if (offset < 0) {
        offset = main_str.length + offset;    }
 
    if (length && length > (main_str.length - offset)) {
        return false;
    }    length = length || main_str.length - offset;
 
    main_str = main_str.substr(offset, length);
    str = str.substr(0, length); // Should only compare up to the desired length
     if (case_insensitivity) { // Works as strcasecmp
        main_str = (main_str+'').toLowerCase();
        str = (str+'').toLowerCase();
        if (main_str == str) {
          return 0;        }
        return (main_str > str) ? 1 : -1;
    }
    // Works as strcmp
    return ( ( main_str == str ) ? 0 : ( ( main_str > str ) ? 1 : -1 ) );}

external links: original PHP docs | raw js source

Examples

Running

1	substr_compare("abcde", "bc", 1, 2);

Should return

Dependencies

No dependencies, you can use this function standalone.

Open syntax issues

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Eventually we want all code to pass or at least take into consideration most fixes suggested by JsLint, following this JsLint configuration we’ve decided on.