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A string can be checked with the below function:

function either_String_existor_not($str, $character) {
    if (strpos($str, $character) !== false) {
        return true;
    }
    return false;
}

A string can be checked with the below function:

function either_String_existor_not($str, $character) {
    return strpos($str, $character) !== false;
}

A string can be checked with the below function:

function either_String_existor_not($str, $character) {
    if (strpos($str, $character) !== false) {
        return true;
    }
    else {
        return false;
    }
}

A string can be checked with the below function:

function either_String_existor_not($str, $character) {
    if (strpos($str, $character) !== false) {
        return true;
    }
    return false;
}

String can be checked with the below function

function either_String_existor_not($str,$character){
    if (strpos($str,$character) !== false) {
        return true;
    } else{
        return false;
    }
}

A string can be checked with the below function:

function either_String_existor_not($str, $character) {
    if (strpos($str, $character) !== false) {
        return true;
    }
    else {
        return false;
    }
}